Your decks won't be able to cover the meta like that, but you could still get a decent position with a lot of luck. Nonetheless, I would advise BL for you as it has a more varied metagame, and my personal observation is that it's more challenging to build for. This goes for all comparisons between upped and unupped, mind you.
CL can be easier to get a good position in due to lower amount of participants, but you have to strike early and know the good picks.