Night and day. The sleeves are longer (6' and 10') and made of gi material, and the gripping sequences are different. If all you ever use is a regular thumb to finger grip, then a towel would be fine for you. I use a lot of thumbless grips in my game.
I don't know how large a role grip fighting plays in BJJ. It's very important in judo, and grip fatigue will be an issue as you advance through a tourney.
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