Stalker’s damage buff is easier to achieve, but is limited to ranged weapons only, and it can be annoying to have to be at full stamina for the damage increase sometimes.
Analytic however increased damage from all forms of weaponry and it also isn’t impossible to scan people when they are mudded. When Fireteam members are only just freshly mudded you can still scan them if you are a few metres away. If their mud is partially worn off then you can scan them still. Some players do forget to mud up aswell whilst caught up in the action.
I was able to beat Samhain’s team using both Analytic, and Stalker on Cleopatra. You can still scan them in but I guess it sort of depends on your playstyle as to which you favour. Ranged plasma users tend to use Stalker more. Players who like to come a bit closer and use Combi throws and bow tend to prefer Analytic.
If there are more cliff faces and trees with good cover on a map then it may be more advantageous to use Stalker, but if not then Analytic may be the better option.