it also depends on how long you want to have this loan and what percentage of payment you want provide (lending terms).
in general I would tell you to check coinmarketcap.
I would certainly accept the first 10 coin in this list, excluding tether/USDC/dogecoin, with the greatest focus on ethereum or litecoin/monero (even if it is not in top 10).
The loan I'm thinking of is for 2 months, and I will be able to pay back at least 0.75 btc.
And I was thinking of exchanging everything I have into ethereum or litecoin, so that's good.