You're right but, in my opinion, Mini vMac works better for System 7 up to 7.1.1. With 7.5.3 and later it's better Basilisk II, which allows also to modify the screen resolution.
Anyway, if you want to use System 5 or 6 or 7 you need Mini vMac. An help to download, install and use it is here : https://www.emaculation.com/doku.php/mini_vmac