I am surprised that the Manix 2 is favored by so many people - it could be that since the PM2 is so often a topic of debate that people that prefer it do not think twice about a new thread on the subject, and seeing the keyword Manix 2 in the title was more tempting to those that favor the knife.
Personally, I would call this one a no contest with the PM2 winning by a large margin. The lock on the Manix is sturdy, and it has a Detent stronger than the force of gravity, but it's goofy to use at best and isn't nearly as natural as the compression lock on the PM2. I feel like the ergonomics on the PM2 are all around about as good as you'll get, and the ergos on the Manix aren't anything I would write home about. To me, all the areas where the Manix is superior aren't as important as the areas where the PM2 is one of the best. More importantly, I think for OP the choice is clear - being used to liner locks, the compression lock is a natural progression of that concept. I feel like the people that transition easier to the Spyderco bearing lock are the ones that either have some experience carrying an axis lock folder or a Sage 3.
My only concern with recommending the PM2 to OP is that some examples have poor F&F, and in its best form the PM2 is unbeatable - but you have a significant chance of getting a poor example if you buy online without handling the knife in person, or if you don't know what to look for. The people that wonder what all the fuss is about are often the people that get a screwed PM2 that has terrible centering, a flaw in one of the 3 major drive components, or a lockbar that is exerting too much pressure, and by extension poor action. The knife should be very smooth and effortless with a strong detent and no side to side blade play. On the other hand, I have yet to see a Manix 2 or Manix 2 XL that suffers a F&F problem that messes up the action. The springs and detent are usually tight, but the design doesn't exert lateral force on the blade.