The infamous question. This has been covered a million times. The only other topic more popular is "Which exhaust sounds better?" (Go to www.mustangexhaust.com) But I see you're new around here, so pardon my whine and here's my 2 cents...
My personal preference for a daily driver that does not see regular 1320 blasts are 3.73s. My wife's has 4.10s and, to me, they are a bit tall for a daily driver. 1st gear is almost unnecessary. But I'm sure many here will counter this thought with the "don't fear the gear" mentality. To each his own...
Welcome to StangNet!!!
It is a personal thing and you have to decide how you will use the car. My stang is a third car...does not see road trips...a weekend warrior. 4.10's are fine for me. But to be honest, I love them on the highway.
If you are going to add a blower, you should stick with 3.73s.
Depends on what you want and how you drive. I love my 4.10's, yet I also like my buddy's car that has 3.73's. 4.10's for drag racing definately. 3.73's for a lot of driving and not really much track use, or if you can't handle the slightly higher RPMS or shifting requirements of the 4.10's. I cruise 30 in 4th, hell 5th works too. I turn like 2750 or something at 70 MPH in 5th(nice for passing without downshifting)