Both are pretty good 30's but the Raptor is now a bit dated.
I would go with the Hawk Pro. IMHO, it has a better and more dependable clutch and start shaft system, a much better head design (you will find many of the newly released 50 helis are now using this same head design), and a number of other advantages. Plus it will leave you with $80.00 to get a better set of servos, or gyro or whatever.
I also have always found the OS 37 engine to be a large step above the TT39 for user friendliness in needle settings.
I found the lighter Hawk Pro, with the OS 37 and a good muffler (like the CN3039) to have a very similar power to weight ratio to a Rappy 50.