The Raptor is the replacement for the Titan as the Titan is no longer going to be produced. It's a better pow board for sure. The Titan was notorious for being a nose diver. As far as for full on mach speeding it goes, the Raptor was great. You can bomb on that board. It is also a fairly light board so depending on how fast you go you might lose a little stability. I did take it down 45+ degree steeps, a few pillow lines, rock lines chutes and such. It was a champ for sure. If you like backcountry riding, or big mountain lines/cliffs/pillows in general, it's a good match for those pursuits. The Raptor is also supposed to be their step up from the F1 and from what I can tell it is.
As far as a direct comparison to the Titan, it's kind of hard to do. The Titan is cambered board while the Raptor uses the RC tech. As I said, it's a great powder board for sure and has the chops to ride the steeps. If anything it's much more nimble than the Titan, but maybe not quite as stable.