I have test ridden both and bought a zesty. The reason i went for the zesty is it pedals superbly and doesn’t feel like a disadvantage on the up hills and I reach my limits on the downs a long way before it does.
The commencal was a good bike too but was too much of a compromise on the up hills for my liking.
The sizing is on the large size, I am 6 foot and ride a medium and the standover is quite snug. Would recommend a test ride if you can get one.
If you are any where near Leeds cross trax have a demo zesty, they used to have a demo meta 5 too, but not sure if they still do.