If you can only afford one there’s a good argument for your emergency fund being in a Roth IRA but when you’re most likely to need it (when the job market is down) the IRA is also likely to be negative, which is a very bad time to sell.
BTW, there are good online only savings accounts out there that make a guaranteed 2.20% APR, I use Barclay’s Bank but there are a few other equivalent ones.