[Haskell-cafe] MonadPlus or Alternative or ...?

I want to generalize a set of functions from lists to some functor type. I require the following three operation types. f a a -> f a f a -> f a -> f a Should I choose MonadPlus and use these? mzero return mplus Or should I choose Alternative and use these? empty pure (<|>) Or should I make my own class? Or is there another option? Thanks, Sean