Despite berndos ridiculous claims, I'm quite sure the GUE "zealots" in this thread don't really care if OP chooses to go ahead with TDI or GUE classes. I'm also quite sure they don't mind anyone recommending TDI instructors or "plugging" any specific agency. GUE might not be right for everyone, but I wouldn't want interested parties get the wrong impression from berndos crusade against anything GUE.
Instead of responding to the ridiculous claims, or sh*tting on any other agencies, I'll say why I love GUE with an anecdote from my last dive. Yesterday I dove with two GUE divers that I've never dove with before. We spent 2 minutes doing a GUE EDGE and discovered and solved an equipment problem before splashing. One diver said his ears were a little off, so we agreed to descend slowly and to let him decide the depth we would go to. We also agreed that I would shoot the SMB at the end of the dive and to do a 1m/min ascent from 6m. Simple things. It was the most enjoyable dive I've had. Throughout the dive, I never had to turn my head to see where my buddies were. Team positioning and passive light communication made it so relaxing. When we had 10 minutes left on the agreed bottom time, the team leader signalled to shoot an SMB. There was quite a bit of current at the time, but we drifted together in a diamond formation, so I could clearly see my buddies while I got out the bag, shot it, and we started the ascent. I've always done the standard 3m/min ascent, so I didn't know if I would be able to do it while reeling the SMB, but because of perfect positioning by my team, it was easy. They were always in sight and a good visual reference for me, and helped keep track of time. It was perfect, like clockwork. We took exactly 6 minutes from 6 meters. Some people, like berndo, might say that this is easy. I know it isn't easy for me, but with an excellent team I was able to do it, they made me better. We were in perfect sync the entire dive, and I've never dove with them before. Was this overkill for a simple dive? Probably. But it's fun! I enjoy the teamwork, and I enjoy the satisfaction of executing skills well. And heading in to technical classes and diving, I know what kind of buddies I would like to have when doing perfect ascents is more important.
Are there excellent divers like these with non-GUE certs? Of course. Are they as common among non-GUE divers? Not in my experience.