Originally Posted by
lechat
the short cage will work up to 30t cogs or so . the limit is listed at 27 'cause that was the highest shimano road cassettes went to. but the B (body) screw will allow for more clearance.
Both short and long spec 27 as the max cog and will work with larger cogs for most people. It's the chainwrap that determines the need for a long cage, but neither of the OP's combinations are exceeding a short cage chainwrap capacity.