It depends a lot on what your situation is. The SOG does not throw as far as the full size, but does have other advantages. It fits easily in an SUV, car, or across your truck bed rather than lengthwise. It is easy to conceal behind low cover and should be sufficient for training in most HT situations. If you train primarily for FT you would probably be better served by the full size GU. Either way they are great launchers. I have three full size and one SOG and that works out very well.
I'm actually more interested in the HT scenario. I figure the sog would fit good on an atv too. Looks as if, according to the info, that there isn't really all that much difference in launching distances.
I train FTs and although the SOG has a shorter throw, I like, on occassion put it on the longer guns - just to teach my dogs that not all throws are nice and high - we have all been there were you get a bird that is not called as a no-bird because it still a decent throw, but not the nice high one that all the other people were getting.....and I like to use it for poison bird blinds.