The ethereum can support 7 transactions per second at maximum. I have some tried some big ICOs (e.g. EOS) which really made ethereum slow, and I needed to try sending the coins every hour during the EOS ICO time, but bitcoin does not have this problem.
And I prefer to use mobile app for transaction, but not MyEtherWallet, I don't like to upload my private key or keystore information because of the security concern.