it all depends what you are using it for
basically you need to look at
– exertion level … are you walking flat ground, climbing up hill, wearing a pack, etc
– continuous nature of the exertion … are you doing belayed climbing and taking frequent stops, are you running up a hill with no rests, etc ..
– conditions … what is the temp level, what is the humidity
– metabolism … do you run cold/hot?
in general though IME …
T2/Cap4 powerdry – used for high output continuos activities like running, scrambling uphill, etc … in cool/cold temps … exceptionally breathable, wicking and fast drying due to the waffle pattern … very durable … no wind resistance at all
T3/R1 powerdry – used for high output top and go activities, or continuous in very cold weather/flatter ground … stuff like climbing or walking flat trails in the winter,etc … exceptionally breathable, wicking and fast drying due to the waffle pattern … very durable … no wind resistance at all
100 wt fleece – same as T3/R1 … same usage more or less, but can be somewhat less breathable … still dries quite fast .. much cheaper generally … do a breath test to find the most brethable one
200 wt fleece – more moderate active uses in very cold temps, or semi static uses such as descending a hill … also works as static insulation in moderate temps … very breathable in general, but varies by the particular jacket … dries very fast … can be very cheap
300 wt fleece – too heavy for most active uses … good for static use around town or in wet weather … can be very cheap
fluffy furry fleece – same as 300 wt fleece … some use it in exceptionally cold weather when active or in semi static situations … works best under a windshell of course …
powerstretch – depends on the weight …. the lighter ones are similar to 100 wt fleece, the heavier ones to 200wt or so … it has some wind resistance
i own quite a few fleeces from mec, dead bird, marmot, westcomb, el cheap ones, etc …
my best advice for active use is to bite the bullet and get something like a T2/T3 hoody … itll cost you 50-75$ in canada … and ive not known anyone whos regretted getting one … to boot they use actual polartec powerdry and are made in canada … so all the materials and sewing is from north america …
or go CHEAP and go around department/outlet stores … and find the cheapest, good fitting fleece that gives the best breath test …
for semistatic situations ,,, i own and use 200 wt fleece … on wet days it works better than down or even synth under rain jackets … ive also worn them while moving in -30C weather
if you are looking for an "action suit" concept and dont want to faff around with taking on/off your windshirt just to put one on/off … get a synth puffy …. thats what climbers use
;)