Budget, existing expertise with a meter and proposed avenues of use further down the line, together with the choice of either analogue or digital will see what you end up with. What works for others here may not necessarily work for you. My personal choice is a Sekonic L758 for its speed and versatility. But I've also angled toward an old Weston. I think primarily it is a question of budget because a meter can be obtained from around $130 on the second hand market to more than $1200 new.