I have a MOD Trident and a SOG X-Ray Vision. I carry my trident more often. The Trident to me is a better built knife. The blade design is awesome, and the handle just feels right.
I do however think SOG makes one of the best AXIS locks, as seen in their Vision line.
Really, get both. But I think it is unfair to SOG to compare their knives to a MOD.
One thing I have to say about the SOG, it has EXCELLENT steel. The ATS-34 on my X-Ray Vision is one great blade steel. However they hardened it, they did it right. I abuse mine, and it holds its edge really well, and sharpens without a problem on my Sharpmaker.
Overall, my vote goes to the Trident. But for a Tanto, the Vision is REALLY hard to beat.SO i guess the decision is first, tanto or no tanto? then which knife. When you buy one, save up and get the other one.