Have not used Sena's remote, but know someone who has it. No memorable complaints or praises for it.

I bought a couple of generic "media buttons" for $10-13 off Amazon that worked fine, until they got wet. The first one shorted out the battery... The second one (Satechi Media Button) I still have and still use it on the motorcycle and mower. Much easier than dealing with the BT controls on either the Sena or my 3M Work Tunes Connect, but again, it isn't waterproof like the Sena.