Scott-
I started making Flemish twist strings and have always been happy with their performance. I like the two tone look. You could start a fight asking if an endless is better than a Flemish or vise versa... I don't think there is much difference when materials are equal (like B50). You begin getting into the high performance materials like the Fast Flight stuff, I think an endless shoots a little better, but that's just me.
I have made both FT and Endless. I find the Flemish easier to make (takes less room to build and the jig is much smaller). I use mostly B50 so that suits me. I also don't like doing a lot of serving so again, I prefer the Flemish.
Either way its fun to make your own strings. Kinda in the same vein of tying your own flies.
OkKeith