Looking For a Strong PvE Warrior or Guardian Build Which Can Solo Champions

I'm looking for a build with high survivability for either Guardian or Warrior which can solo Champions such as Bandits or the Balthazar's rest HP Champion. I do a lot of solo playing and I want to be as self sufficient as possible. Can you also maybe post a video of you doing the Balthazar Rest HP boss for example? I just want to see how good it is before I comment to buying all the gear.

For Guardian theres the Balth Build, which is really beastly as long you maintain boons. Its from before the Sigil/Rune revamp, so I tweaked a few things

https://en-forum.guildwars2.com/discussion/26085/best-build-for-pve-and-how-to-be-balthazarFireBrand version- Radiance runes are for the Aura bonus, as Light Aura can be an extra source of retaliation, and gives a little condition damage mitigation. Can be swapped for Leadership runes to use Save Yourself to absorb conditions from allies, and use the elite skill after to convert some to boons.
Radiance: http://gw2skills.net/editor/?vVAQNAR8enkICFBj97AuCBEEhl4BrKA0AqX7v0baP1qEkviUA-jRCGQBKR5HAPCAp8CAUt9HsjuBAcQAWk6PV8BAUFlgkCIwVaA-e

Dragon Hunter variant: http://gw2skills.net/editor/?vVAQNAR8enkICddi97AuCBEEhl4BzqEkviUy/v+3CsKA0AqXA-jRCGQBV8BAYHdDA4gAsI1fS5FAoKKBB4RAQJK/q2+DkCIwVaA-e

Warriors are a lot harder because their sustain is strong, but limited in time span. I would say Spell Breaker since they flow a lot better; but DPS warriors need you to be on point when it comes to managing defenses.

I would say the Marauder variants of the builds below to be your best bet. if you have all Zerks gear, you can easily test the traits and weapon setup, and then later transition to Marauder Trinkets (via LS3). You can deal with the armor later on, if you actually need more HP/sustain.https://metabattle.com/wiki/Build:Spellbreaker_-_Strength_Greatswordhttps://metabattle.com/wiki/Build:Spellbreaker_-_Dagger_Sun_and_Moon

With Might Makes Right + Magebane Tether and Adrenal Health (Strength, Defense, Spellbreaker) as well as Healing Signet, you get incredible sustain, even as full zerker Warrior.

Add to that food that increases endurance regen and grants might on Dodge, and you are going to have to try pretty hard to die in open world especially.