[Callers] Differing styles of techno contra

Hi all I have a question about two different styles of techno contra. The question is mostly directed at folks who have done both, since I'm curious about whether you have a preference and if so, why. Some techno contras have continuous music -- the dancers just drop in or out at the bottom whenever they feel like it, and the caller treats the night like one long medley. The other kind is more like a regular contra. The caller teaches a dance, the music starts, the dance runs for however long it runs, and then it stops and folks re-partner for the next one. As a dancer, which style do you prefer? How about as a caller? Kalia