Well I'm a bit busy so my kindness will stop at giving the single core score
, but check geekbench for mbp late 2016 15" for more details.
The figure are base 15" 3961, middle 4087, and maxed out 4251.
In muti-core it makes a difference to go for the 15", obviously. But remember that your software is probably not using the multicore capacity (it's pretty rare they do).
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I do think this sounds condescending !
He's asking because he might want a vague idea of the difference, or have more info to make his choice.
For instance you might hear the same question about RAM and personally I'd advise 16GB no matter what.
CPU is more tricky, because people don't really know the performances gains IN PRACTICE (I mean, I discovered it once Geekbench had results, and had already ordered my machine) so it's worth asking.
Also people don't even know which software truly take advantage of the multi-core, and sometimes go for quad-core for no reason.
Also, there are no stupid question, just help him.