The SR2 is the right place to start although I haven't thrown the GT1 I recently purchased used and many Motivnation folk will tell you it is the best of them all.
The SR2 is very mild in the front with smooth midlane and finish. You won't too often see Motiv equipment get all jumpy on the back. The downside to this is I often find myself switching away from their stuff when I have to get my feet way in.
That said Motiv quality is the best in the business I believe. We have a heat box for oil extraction that needs manual rotation of the ball every 5 minutes or so in order to keep the ball from cracking. I have had a few occasions where I get caught up with customers and cracked some stuff from overheating.
That said, on one week I forgot the SR2 in said heat box for over two hours. Heat bulbs beating down in one spot. When I took the ball out it was smoking. Two days later I left it in the car after bowling cause we got over a foot of snow. I am usually pretty kind to my equipment but in these instances the SR2 cover never blinked. No cracking, no discoloring, no loss in reaction.
Drill the SR2 and see what I mean. Reaction will be something like a Danger Zone or a milder Gamebreaker. Very controllable, true read especially from straighter angles.
ALL STAR BOWLING & TROPHY
LANGAN'S ALL STAR LANES
IBPSIA MEMBER
WALLED LAKE MI