I would say go with a merino wool baselayer (Minus33 is a very affordable brand when compared to manufacturers like SmartWool) and use whatever you like (synthetics) over it. I'm a pretty sweaty guy and if I use a synthetic base layer, the fabric ends up stinking to high heaven. Wool doesn't really get stinky for me, and it's great at wicking. Cotton, on the other hand, is something I would avoid at all costs. It gets wet and stays wet, and starts to stink. When scent control is important in your hunt (such as when hunting deer), cotton should be avoided at all costs.
