Honestly, the chips are pretty comparable...
https://ark.intel.com/compare/126689,126687
The i5 is $30 more on Amazon. You get two extra cores and 1MB more cache. It's up to you whether that's worth it. I don't think it will make much difference with MAME.
On the other hand, the i3 is unlocked, so if you put a good cooler on it and get the right motherboard, you could probably overclock it to 5GHz if you're lucky.
GroovyMAME support forum on BYOAC
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