Which heirloom should i get?

I'm roughly on 480 apex packs with no heirloom and i haven't bought the bp yet. so im pretty much guaranteed to get my first heirloom shards this season. the problem is i have no idea who to use them on.

Right now, i'm playing valk, i've had around 100 kills with her so far this season and i had around 100 before that too, although my stats aren't the highest with her i love playing her, her tac great for pushing out enemies, her ults useful for me as i like playing ring over edge in ranked and her passive is my favourite part of her kit since im on controller and lack a lot of aerial movement, she also has some of the best cosmetics in the game imo and i feel she represents me as a member of the lgbtq community.

Another option for me is octane, i have 992 kills with him and played him loads in earlier seasons, i have the most skins and most everything really for him. I've had my best game ever with him being a 2.6k and love his stim and his passive. yet i feel i wont main him again due to metas and me not being 13 anymore.

A few more smaller options are horizon: whom i feel i play best with, and bloodhound: whom i picked up at the end of last season for a gew days and really enjoyed playing, but i think he's outweighed by valk in my preference.