Help with server hardware

I want to minmax as far as my budget could go, but if it's only marginal then it's pointless, and I'd rather not to.

So, I have an existing i7 7500u laptop, and I'm comparing it with an acer chromebox that has an i5 10210u processer in it (selling for $70).

How big is the performance leap for a theoretical server that has 20 concurrent players with 30 or so light to mid plugins? Or if it's even feasible or advisable to run a server on a chromebox at all, and if so, is it worth the performance increase for the price it's selling?
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