I'd go as far south as you can, but stay close to I-5, so your commute isn't too bad. Check into the Lacey or Olympia area. From there you can go west towards Aberdeen or south towards Portland for your hunting. The further you get from Tacoma and Seattle, the better off you will be. You can get into good hunting in a half hour to an hour drive from Lacey.
Whether to hunt archery, muzzleloader, or rifle seasons really just depends on your schedule and when you want to hunt. Archery season will give you most of September to hunt, plus the late season which runs from the day before Thanksgiving to December 31st. Rifle season will give you almost 3 weeks in October, and then 4 days in November. Muzzleloader gets a 9 day early season and a 3 week late season.
There's really no way to say which one is better, it just really depends on what you prefer. You can also apply for the multi-season deer permit, and then you don't have to choose, you can hunt all three seasons.