As long as you've never had a computerized machine you don't know if you are missing something I suppose.
I myself am sewing on a mechanical one and bought a second one ( exactly the same but much less used) as a reserve.
I can sew and eat and sleep with the old one so I don't want to have a computerized, and that is even more easy as I can't effort one that is strong enough as my old one...
So look at the amount of money you have and find out which machine you can buy with the features you want on it.....and be happy with it even when it's a secondhand mechanic again!!!!