I agree, consider what you'll be doing.
I owned an RFX, but sold it to a very grateful friend. I got a Moment as a replacement.
The Moment has bearings instead of bushings. Bushings may actually be an advantage in very wet climates as grease can be pumped in to purge out dirt. They take a little while to break in, though. I rode my RFX hard for several years and never needed to replace them.
A large Moment would probably be OK for a 6'3" rider. 5-spots have 2 larger than "large" sizes, so try to swing a leg over both bikes to check sizing.
The Moment is now available with the Fox DHX 5.0 shock, which I feel will be more reliable than the Romic. I hear the Romics work great when they work, but you almost need to have a spare shock (or a spare bike).
The Moment's travel is 6 inches with a coil over, 5 inches with an air shock. The 5-spot has 5 inches. If you're keeping your Truth, you would probably want 6 inches so the bikes won't be too similar. If you want one all-around trail bike, 5 may be better.
My Moment looks incredibly sturdy, but it doesn't have a track record yet. The 5-spot has held up well under some pretty heavy (no offense) riders.
To confuse you further, it sounds like Turner may be releasing 6 inch travel bike next year.
I don't think you could go wrong with either bike. Good luck.