i thinks its ok to have two services. That way there is another barrier if your account data leaks somehow from another service and you have used the same password.
I use 2-Factor on every site that offers it anyway.. So for me it would be better to have one site. But i understand, that its better for people who don´t use 2 Fac.

B.t.w. i just transffered some BTC to CoinLender. I hope this service stays up a long time! Whats the current rate we are getting on the amount in the account?