For the most part it's six of one and a half-dozen of the other, but in some cases one has the advantage over the other.
I can think of two instances where an endless definately has the advantage: really short strings (really short flemish strings are a bugger to make properly), and horsebow strings with the siyahs (sp?). Those giant loops make guaging the length properly a test of nerves and patience.
I like the adjustability of flemish, and I like the look better. I can and do make both, with 90+ percent being flemish...at least for now.
I had no idea making endless strings was so dangerous though--from now on I'll be sure to wear protection!
Chad