I guess you have to figure out what you want to do with the car, 1/4 mile racing, track events or just street cruising.
If I was going to race my car on the 1/4 all the time then would go with the 4.10's.
I dont plan on doing that, maybe some track driving and thats it, so just a bit higher was good enough for me.
Also saves a bit of gas on the hwy as I drive my car from Mar 20th till Nov and on the hwy a fair bit.
If you go 3.90 or higher you better get some extra wide and softer compound rubber on the road to hookup.