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For sure. A pi can't run ps2. A rock 5b may be able to though.
For ps2, I'd advise buying a refurbished Dell optiplex micro with an i7 6th Gen and 16gb ram. You can grab them on ebay for between $100 and $200. They usually don't have bt, so you'd need to buy a dongle for the controllers.
As far as storage on a pi, you could get a 2TB external SSD. Then you could have entire sets, like dos, amiga, and ps1. Read time from usb isn't a huge issue for those systems.
The Odroid n2+ is another solid option if you want an sbc for emulation. Hardkernel makes quality boards.