The smaller blade and thinner handle are easier to maneuver, IMHO.

Another tip: BEFORE any painting, as you are getting to the end of the bodywork and surfacing, trace the areas that you will be foiling (drip rails, reveal moldings, rocker moldings, wheel moldings, etc.) with a pocket scriber. Most tool outlets carry the "General" brand scriber with the hardened tip that will last a long time working on styrene.

You don't need a ton of pressure, you just want to start a groove for the nib of the blade.