Have you seen X in his Shadow Armor? He can then stick to ceiling, step on spikes without taking any damage, etc. Also, he can use a saber as well with that armor.(He doesn't have to use the Force Armor right?)

I pick the Shadow Armor because it will turn X to a ninja sort of robot, making this match more fun. Beside the abilities to walk on spikes and stick to ceiling, X's movement will be also a lot faster. He fires shuriken, or ninja star, instead of his usual energy shot, and uses a Cresent (Energy) Sword attack when charged up.

With Shadow Armor, X can equip 4 parts and 1 limited part to further power up it. The four parts:

Speedster - Increase X's walking speed, (which will be quite fast combined with Shadow Armor) and the speed allows for longer jumps.
Quick Charge - Charging takes only half the time.
Rapid 5 - Let X to shoot at a faster rate. Normally, 5 shots per screen, but when combined with Speed Shot...
Speed Shot - Further increase the shooting rate by 1.5

For the limited part:
Overdrive - For a limited amount of time, X can rapidly fire Charged Buster Shot, regardless of armor.