Thinking of changing my mesmer's armor stats
2) is easy, zerker for general use, pure assassin for spamming reflects in PuGs, zerker/assassin’s mix if you run with fully optimised groups a lot (if this option applies to you, you probably shouldn’t be asking this question in the first place…)
As for 1), rampager has several problems: damage condis on mesmer aren’t all that good in PvE (enemies don’t move/attack a lot, iDuelist bleeds are single target), you want precision and ferocity when running reflect-bot, and you’re forced to maintain a weapon+trait loadout that supports “hybrid” damage (so basically Dueling and/or Illusions)