I flew nothing but the OS LA .46s in Fun Fly competition and had never had one wear out on me, the .40LAs in trainers yes but not the .46s. Great running and easy to tune. I'm also a big fan of the PRO series .46 engines. The EVOs were pretty much a dud. I haven't tried any of the SK line of engines other then there .91 but like them better then OS. I can't say how there smaller engines are, I just have nothing in the 40 size to use one on.
I feel Super Tigre and Magnum are a waste of time and money, others love them.
OS is the better choice but if money is a problem it's hard to beat there LA series of engines for trainers. They work great in most any 40 size plane too. Not 3-D power but a good all around engine.