Druidic Avenger gains up to 3rd level spells (very nice, but a few of these are available to a Ranger with a wand anyway), and one rage use per day (meh). Ranger gets full BAB, more skills and -points, better HP, the Endurance prereq as a bonus feat (as well as Track), a (weak) animal companion, and 1st level spells. I think that, for a melee focused PC, Ranger just offers more and better. If you want spells, just go Druid all the way - Druid casting isn't all that powerful before 5th level (few exceptions, obviously), and if you don't gain anymore spells later on, those 3rd level spells will quickly fall behind in usefulness. Also, Avenger doesn't get spontaneous summoning.