What difficulty is harder?

[Levenheit]

Master in vanilla or Expert/Revengeance in Calamity mod?

[Chief Beef]

as someone who has 1000hrs on terraria, mastermode vanilla is easier

[Cyseal]

Playing Revengeance at the moment and definitely feels like vanilla master is much harder.

[Amazing Sun]

vanilla get fix boi seed master>.> is harder

[Hatchedbarley2125]

Master mode is harder the revengence mode also calamity has a lot more weapons, armor, and accessories then vanilla which I would say that makes it easier and vanilla is more balanced and master mode just increase hp, attack, and defense but calamity has more boss and a longer progression to endgame and has post endgame stuff if your looking for a challenge and your have more then 200 hours then try death, Master.

[Flyin' High]

Revengeance changes stuff, mastermode is just expert with stat inflation
if you can consistently beat expert mode without much trouble you'll probably find mastermode easier, as it's just expert mode but everything hits harder and has more health
if you are aren't at that point revengeace will probably be easier

revengeance is changes a lot of boss mechanics or adds new ones, which means there's more learning to do and bosses might throw you off, but at the same time it's about as forgiving/punishing as expert mode, you can tank a few hits and enemies don't take long to kill

mastermode is just expert but enemies/bosses have more health and do more damage, so if you can beat a boss consistently in expert mode, you should be able to consistently beat them in mastermode, but you need to dodge attacks for longer and get punished harder for messing up, mastermode is easier from a "how hard is it to fight this guy" standpoint but you get punished way more for messing up
it's worth noting that calamity in general is significantly harder than base game Terraria though

[JOA]

master mode death mode is the hardest i played with my friends

[JOA]

we couldnt get past skeletron