entertainment is subjective tbh
you can make the reverse argument for a bm dueler being worse at gm duels because they aren't used to prolonged fights
also might be more prone to making mistakes due to "boredom" as you put it, even though I wonder if that actually happens with a person that enjoys the drawn out nature of a gm duel
edit: bm dueling isn't really dueling, seems more like people mashing their toons at each other multiple times, looks a bit more like world pvp. Gm duels are duels, remember, duels by definition have agreed rules (like in a pistol duel... how many paces)
Nah i used to go into fpk/gm duel games all the time and 1v7 them and kill them all over and over and they’d rejoin with huge buffs and still die. The guys are usually top gm duelers with amp necro/ druid/ leap barb etc but they don’t know how to duel against 1 decent bm player despite huge advantages.
and yes they had juvies. Multiple videos in the youtube channel about it. I’d beat most in 1v1 gm as well which i also have videos of. I do both gm/bm and am great at both and have proof of it so my opinion actually matters unlike urs.
And i say Bm is funner, gm is ok. Definitely less entertaining/ slow paced, both take skill but saying gm takes more skill is goofy , you’ll win every time if you play defensive enough