I learned TKT TKT, and had a few problems - basically due to having a terrible teacher at the time, who just told me how to do it, but never gave me advice as to how to make it better.
I then went to university and was told about TTK TTK and my teacher worked with me getting this clean and accurate. Then we moved on and got TKT TKT working well. By the end of that time I could use either, depending what the situation calls for. There are some pieces where TTK TTK makes more sense, others with TKT TKT.
My advice (and one which I use with my advanced students) is to learn EVERY possible combination of tongueing, that way it doesn't matter what you come up against, you are prepared for it.
Personally I use TTK TTK for just about everything, but I can go onto TKT TKT. The TKT KTK really annoys me, I can do it, but it never sounds quite right. Back to the practice room
