@platinumtulip that's at least a fairly easy need to cater to, all that needs consideration is the CPU's single-core performance. no need to fret about what graphics card is in it.
i find there's somewhat less emulation community around the mac though; i had OpenEmu working well enough for the common stuff on my 2013 MacPro but there were some things it didn't support that I wish it did. (such as: my gamepad)
@wildweasel hmm yeah, that's a good point. i used OpenEmu back when i had a 2013 MacBook pro as my only computer and enjoyed it, but i also remember running into limitations with the systems it supported at the time