Coilovers or no coil over ? 4" lift or 7"

Anyone out there that can answer this question . I was told by installer if I lift 4" or higher to get more of a better ride I should a coil over system , how much better is it?? Is there a ride difference with 4" lift on 35 tire vs 7" lift on 37 tire ? Please help me I'm drilling my head on which way to go

 

Not sure what's s good 4" lift, I prefer fox coil over 2.5, I like the BDS 7" coil over but they don't offer a 4". Do you know of kit that has the fox setup or is better if I build? To answer your question on the 7" lift my 15 tundra stock won't fit in my garage lol, it's 2 " to long!! I originally wanted a small lift to fit I'm the garage but since it's going to be outside I don't maybe I should go bigger. Do you know if there is a ride difference between 4" & 7" coilover? I have a good size budget for the lift, so price is not an issue just want it to ride good. Thanks Sean226

 

Thanks ! Still need to know if there is a big difference from ride quality from 4 to 7 coilover system. I like the look of a 7 but I don't want to sacrifice the ride quality.