A 15” wheel with a 60 profile tyre compared to a14” with a 75/78 profile tyre, behaves exactly as you would expect: slightly more precise turn in, better steering feel, slightly less absorbency on bumps.
For me, it is a no brainer - the 15 is the better compromise by a significant margin. But your priorities appear to be different and you will have to decide for yourself.
Virgos are not heavy.