New Level 80 looking for dungeon advices
A Grenade Kit Engineer will deal the most overall damage and at the same time provides great support due to 20+ stacks of Vulnerability and other utility skills he can bring.
More information:
https://forum-en.gw2archive.eu/forum/professions/engineer/Grenadier-build/first#post2986584
A Bomb Kit Engineer will deal less overall damage but more direct damage; is “only” able to inflict 7-10 stacks of Vulnerability but comes with a fire field and blast finisher (combos), and can bring even more support if so desired.
Example build:
https://forum-en.gw2archive.eu/forum/professions/engineer/PvE-Dungeon-Speedrun-Zerk-Build/first
This might also be helpful:
https://forum-en.gw2archive.eu/forum/professions/engineer/Engineer-PvE-little-help/first#post2992442
Was in your same boat a couple months ago, freshly 80 and looking to start some dungeons. First thing I did was pick up a set of rare armor on the Trading Post and mostly masterwork trinkets as they were more expensive. Everything was a mix of berserker and knights.
For a build I went with someone’s zerker dungeon build. https://forum-en.gw2archive.eu/forum/professions/engineer/PvE-Dungeon-Speedrun-Zerk-Build/first
Later I tried a standard grenade build and standard static discharge/rifle build. Both were fun. I liked the vulnerability stacking using grenades but standing back so far you sometimes don’t really feel like part of the group. Static discharge is great but I feel like the bomb build above does more damage and is all around more fun.
Side note about pistols, I think pistol 3 is great but otherwise rifle is better. I love the look of pistols but they really do get outclassed by either rifle for damage or pistol/shield for defense.
Also, about damage vs support. I think all classes are primarily dps. Funny thing about this game not having a healer or tank is that everyone pretty much defaults to dps with support backup. Some classes just have more backup than others.