So, which should I get?? Here are my two choices---



Nice midweight zip neck merino Smartwool top. (Already own a "set", large under an extra large---for my winter baselayer, but it's worn out.)



Or a Patagonia Thermal top (what used to be Capilene 4).

Capilene vs merino. The capilene 1-4 designation seems to be over, now it's Thermal or Midweight etc.