Full HealerI run max mana gear (club, armor, main slot charm) up to around level 10-15, statting all points into intelligence.
From 15-71, I try to focus on gear which will give me 100+ intel and as much heal mastery as I can find.
Always run your EE heal charm from the accessory slot with a Heal Mastery or Max Mana charm in the main.
Tanker HealerI've found two effective tanker builds for Guardian
1. 100 Vitality, Rest in int.
2. 100 Dexterity, Rest in int.
Gear for each of these builds would be HM/Dex/Vit Clubs-- EE/Dex/Vit Plate or Chain Mails -- HM/Dex/Vit Main slot charms
Both builds are very effective tanker builds in catacombs, especially if you can find a decent EE Plate Mail.
I've never run a Melee or Melee Hybrid Guardian...so I'm not so sure I can help with those
Hope my little bit of info helps ofc