I think a 10 year old boy would really enjoy Via Napoli or Biergarten in Epcot!
I enjoyed Spice Road Table but I think it is a bit more adult with the tapas-style dining (that said there are some items I think would be a hit for kids too, e.g. the lamb sliders).
Like everyone else said, Skipper Canteen for MK is de the way to go. The Plaza was also someplace my family enjoyed but we haven't been back since our 2014 trip.
Haven't had a sit down meal at EPCOT so can't speak to that.
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