There is one difference. Mages don't have a choice. Templars do, even if they aren't given "full disclosure." So I feel for them, but I don't think it's equivalent.
Well, comparing their sufferings to see which one is the most miserable between the two's rather pointless IMO. My point is that when mages' suffering is quite explored & rather vocal (they do complain a lot about it), Templar's suffering are rather endured in silence. Except for Samson's rants, I don't see them complaining a lot.
Mages don't have choice, but Templars made the choice to endure the suffering in silence. I'd even put my sympathy a bit more with them actually. They know that their life will basically be a sacrifice, but the job need to be done. So they do it. Without complain. Templars (some at least) choose to be there, choose to endure the it. Mages endure the suffering because they don't have much choices. Templar choose the sacrifice.