a pool should also offer different multi-algo coin accumulation variants, not only most profitable "now", but also something where I can accumulate coins based on low difficulty, because nobody wants to mine them "now". and free selection/grouping of my multi-algo selection (from what's available in the pool of cause), alternativly to fixed variants. maybe someone understand?

It is not easy to say if there is a "best" pool. But if you are looking for a reliable one, I believe kano.is is a safe choice, good transparency too and reputable service.