Fruggums

In New York its easy to take the block system for granted. Since streets and avenues and numbers are all in logical order it's pretty hard to get lost here (in Manhattan). 

Compared to Mumbai (Bombay, i.e.) which is a haphazard system of curvy roads and lines in a big mush where the names of streets hardly holds much value except for the postal service. After getting the chance to experience both, lets compare.

If you walk down a street in between avenues in the middle of Manhattan with no traffic on it, its completely silent. The block system is supreme when it comes to noise control between streets. The buildings on both sides act as a vertical funnel for the noise channeling it upwards so it doesn't spill into the next street and an ambulance siren will only reverberate in a street in the second it crosses the intersection at the avenue. 

Unfortunately for the people living in the vertical funnel of noise, it only serves to amplify the sirens and ambient traffic. So everyone gets their fair share as the vehicle screams along. 

In a non-block system (Mumbai specifically, of course), noise isolation between sections is poor. In this system, buildings aren't always facing each other, and due to the unsymmetrical (and fairly larger) plots of land, the buildings don't always take up the entire plot (leaving space for parking garages or a lawn, or as of late swimming pools and gyms). Hence there isn't much channeling of noise and depending on your situation the noise can simply travel up to your floor because it radiates all over - however, although one could possibly be on the receiving end of a larger quantity of noise due to the space involved, there's no funnel to direct and amplify it. So the overall received level of noise, is less, especially so if you aren't facing a road. Since Mumbai isn't completely flat (unlike Manhattan, which is for the most part), elevation varies, roads twist, and people can land lucky situations.

The block system wins in transport (both in reducing congestion and time for travel). A grid system distributes traffic extremely efficiently compared to a non-block system. Manhattan has two major arteries on the periphery of the island (FDR, Hudson Pkway), which makes it easy to skip over as many blocks are required then re-enter the system. Mumbai has similar, but these arteries are a part of the non-block system instead of being separate entities. That is, they are roads used to access housing, business etc. while Manhattan's arteries are dedicated highways. 

Its easier to get around when the streets are numbered and the direction of traffic alternates. In a non-block system its just simply the opposite. Random roads become one-ways and its impossible to know the name of every street in Mumbai. 

If one avenue gets clogged in a grid, the traffic can simply be diverted into adjoining streets to find alternate routes - since streets alternate in direction, the jam can dissipate easier. In a non-block system, if one main road gets clogged, it just spreads a traffic failure to connecting roads - because of the haphazard manner in which the traffic flows.

This is also complicated by signal issues. In a block system signals are timed extremely efficiently to ensure traffic flows in neat blocks (you can notice this anytime you look down an avenue in Manhattan). In a non-block system, due to major intersections composing of more than four roads (each in different directions sometimes) - signals have a hard time ensuring an efficient flow especially when the pattern reverses between the two rush hours. 

In a block system, there's a very good chance your view is simply someone else's window. Since every building occupies its entire space, unless you're higher than the building you're facing - your view is pretty much their view which is you (get it?). Having a-building-as-a-view-system also means getting cut off from the sun when you're in its shadow. An exception to this is (other than being higher up) is the corner view. The people in the corners of the buildings can usually see down the avenues/streets **

In a non-block system, there's a good chance your view encompasses more than just another building. Again, due to the erratic sizes of plots, spaces for garages, orientations of buildings, irregular width of roads, varying topography etc. etc. there's a good chance you're going to be able to see more. The non-block system also means that if you happen to be staring into another building, the gap is probably a bit larger. Since a non-block systems' edge artery roadways aren't highways a lot more people get a view of the sea. 

** Another exception is anyone overlooking central park, which is the best living view on the planet, that very, very few can ever afford. 

And that, is the block system.