When I got into this hobby, I started with a 2-strk (OS .46FX) on my trainer and had a blast with it and still love it (now on a Superstick built for speed). I bought a YS .91FZ for my second plane to try a 4-strk and I will tell you, I haven't look back yet at 2-strks. I have only bought 4-strks since. I have a OS .46FX, YS .91FZ, YS 1.10FZ, Saito 40 and a 40 LA that was given to me after a club member bought a Magnum 52 (4-strk) for his trainer. Another converted happy 4-strker. LOL...

4-strks are so much better and less messy. I fly 3D and 2-strks just don't have the low end torque that is needed for this particular type of flying IMO. The larger 2-strks are better, but I would rather have a 4-strk or simply go gas. My OS .46FX on my superstick is a lighting rod with wheels. I think the best place for 2-strks are on trainers (cost less) and on speed planes because you want the high RPM's.

I say go for a 4-strk and really learn what flying is.

BTW, the 40LA that was given to me is still setting on the shelf collecting duct.

Happy flying
DTB