Standard and mild mods, eg exhaust, bit more boost, filter, big cooler etc both cars are good daily drivers (make sure you got a good alarm). If you want to do lots of mods the gtr is probably a little better to drive daily as the gts dont have any traction.
The 34 is a real nice car (my old man has one) if you want a performance car and enjoy driving hard get the gtr, if you want a good cruise car with decent performance and handling get the 34 gtt.