I went with T30s because of being able to V-plate - who doesn't like free dB?T30 vs. T45: My opinion based on logic alone (I have no experience with either, T30 or T45)...
- T45 with wheels on one end seems like it would cart around a little easier with the "handle" end at a comfortable height very similar to a hand truck, less bending over except when laying them down/standing them up.
-T30 able to be V-plated.
Obviously outdoors is a completely different animal than inside when it comes to subs. But inside, I have been blown away at what my pair of T30s sound like. I have the drivers to build 2 more, hopefully will get to that in the next month or so. One thing I've noticed when "DJing" for events - think wedding, or party/dance - as opposed to a DJ "concert" where that is the only focus of the event... my 4 Otops and 2 T30s can easily provide more than enough sound for everyone except maybe the most diehard music fans. And the sound is full and amazing, not harsh. I hate that harsh, fatiguing sound that so many DJs blast just because they think it's supposed to be LOUD. Last gig (pre-COVID) was a room about 40 wide by 100 deep, 30+ foot ceiling and I was able to pound it at will. Saw 125dBc on my meter about 15 feet out.
Pick a cab, and just keep adding if you need more. Pretty sure you won't be disappointed.