This matchup still pending.
I assume you mean the spit16 and G14.
The spit needs to fight downhill and use it's turning ability. The G14 needs to fight in the vertical and use it's speed to extend and keep separation while creating angles or a rope/stall on the spit. But as INK already pointed out, this all depends on the situation. Alt, player ability/knowledge, speed, weight, timing...etc.
In a co-alt duel, all the G14 has to do is climb after the merge and start the BnZ and catch the spit in the rope or in a turn with a deflection shot. The spit would have to hide it's E and surprize the G14 in the climb or sucker the G14 to engage in a turn fight.