Well..........
As a keyboard player who has spent a musical lifetime, wishing he could play guitar.. but cannot...
You can make very passable guitar emulations with a bit of work and effort in understanding what is required to emulate a guitar sound and how it is played by a guitarist...
While the sounds themselves are fairly important in creating a passable guitar emulation using a midi keyboard... it is much more about how you play and how you use controllers such as pitchbend, aftertouch and so on, that really allows you to make a sound... sound like a real guitarist than anything else...
You can easily start off using the built in sound and FX libraries with Logic Pro X and get some 'in the mix' guitar emulations that work reasonably well.. and later, if you wish you can step up to using plugins like the sampler Kontakt and Guitar libraries like Pettinghouse or Electri6ity, which provide many different articulations such as slides, palm mutes, pinch harmonics, tapping, trills, octave chords, unison bends, harmonics, release notes, fret noises, hand noises, pick noises and strum noises... along with the use of Amp and pedal simulation FX plugins like Guitar Rig (GR)... or you could go the other route and use a specialized guitar emulator plugin like Musiclab's RealLPC or RealStrat.. again used in conjunction with FX plugins like GR or Amplitube...
But again, it is much more about what and how you play... rather than the sounds themselves, to produce a fairly convincing guitar part in a track.... and such techniques take time to learn...