I usually run Peaches map with a strong hit type crit. Sometimes I run ReCactus map but I'm not sure Fragment drop rate is higher on ReAS maps.
I also like Dendribium+BB map even if it's a two fights map.
For Memory maps, I always do the second one from the top. The boss is just a huge HP bag with weak attack. it's easy to kill it in one or two turns before it goes crazy.