What kind of screw is on the MacBook Pro mid-2014

Grant,

OWC install videos show the 2013-2015 MBPs having pentalobe screws in the bottom cover.

Probably a pentalobe 5 but you have to look. Screw head types can vary within one model year. This is from OWC's site showing the pentalobe 5 and the Torx 5:

Phillips screws and Torx screws are used for User-serviceable areas.

Pentalobe screws are used to secure things Apple never expects Users to remove for any reason.

"What Apple expects user to access" has gotten MUCH smaller over the years.