Help me pick a class for SL pvp

Im a returning player. Skipped Legion and BfA, didnt play much in WoD either. Im looking for a class to play in SL (arenas and bgs), can be a healer or ranged dps. Melee characters are not my style. When I pick a class Im only interested in the pvp aspects, I only wanna do the bare minimum pve. (I dont care if ignoring pve will put me in a disadvantage, I just wanna have fun after work in random bgs or arenas)

Basically I would like something thats fun in PvP and maybe not the bottom of the tier list. People used to say Disc priest is good but for some reason I sucked at it, so maybe I would like something thats easier to play. Or rather forgiving if I make mistakes in 2v2.

I used to like the pvp aspect of the game. I mained a priest. Shadow till WotLK and then Disc. I was also a fan of Affli Lock on my alt. I was never good at disc priests in pvp. In fact I was pretty bad, tho I kind of enjoyed it.

Basically I have some free time to kill and I thought I would level up a character, just to get a feel to it. I think its a good idea especially if I you guys suggest something new like MW Monk.

I heard mages are usually a safe bet, but before picking mage I rather go thru what other options I have. I would have the mage as a backup plan. I tried to do bit research on affli locks (cant see myself playing demo/destro) but Idk how affli gonna perform in SL pvp.

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Characters I have played pvp with (and I would not mind continuing if you say so)

Affli Lock, BM/MM Hunter, Shadow/Disc Priest, UH/Frost DK, Frost Mage, Resto Druid

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TLDR: What ranged/healer class sounds promising for a casual pvp player in SL - mage backup plan

Also which side should I go if I like random bgs?

Thanks