depends on speaker to be driven also, which you did not mention @blkwrxwgn
part of the fun in this hobby is pursue what you are curious about, experience it... so if that is SET moreso than PP then go for it
the primaluna vs willsenton are very different amps (albeit both tube amps), different input and power tubes, different transformers, different circuits, different features, etc etc... set vs pp is just one dimension of difference of probably 10-11 relevant attributes
in either case you will likely end up doing some tube rolling to find out what each one can really do
final thing... unless something has really changed for the better with willsenton, you will get much much better support for primaluna (i believe you are in the usa, iirc)