Open V wheel on v rail or MGM track

Hi

I was about to build an OX bason on C-beam and I would like to know if a linear motion is better than using the V wheel running on the small v-rail ?

For the track, I'm looking at Hiwin MGM12. I know the big HG15 or HG20 is vey the best, but is the small MGM is mostly equal to the Delrin v-wheel... Or even the small size of those track will made a better match and outperform the v-wheel.. ?

Thanks for input.