Why are the Tech Tree Tigercat on paper than premium one again?

My current understanding after a quick read is that Tigercat-3 is powered by a better engine than Tigercat-1, though that better engine needed MW injection to reach the same HP as Tigercat-1 engine.

But the F-3 has better top speed, better climb rate even by a .5 second margin, and better accel. shouldn’t the TT one be the better version?