It really depends on your style.

My partner and I started off with a pump filter (MSR Miniworks) but to tell you the truth after hiking and fishing all day, the last thing that we wanted to do was pump water and so we switched to the Platypus CleanStream Gravity Filter and now all we do is fill up the dirty bag and hang it from a tree and let gravity do all of the work.

Granted it is a couple of ounces heavier than most pump filters, but it is more packable and has a better output per minute than most pump filters.

We also still carry chlorine tabs or drops because anything can happen: bag gets a puncture, the pump brakes etc and for an additional 1/2 ounce and minimal space in the pack it is no hassle to throw in a bottle.