Yes, the FSSP is better than the Novus Ordo.
No, the FSSP isn't as good as the old school SSPX founded by Abp. Lefebvre, due to their compromises with the Conciliar Church, Vatican II, etc.
After all these years (since 1988), they still don't have their own bishop, which was "the deal" they were supposed to get -- the deal offered to +ABL.
I'm sure there are some good apples in the bunch, but that doesn't change the fact that the organization is fundamentally compromised. Anecdotal evidence isn't as strong of an argument as fundamental flaws in an organization.
You might as well argue for the piety, holiness, and/or good will of various Novus priests, as I'm arguing the deficiency of the Novus Ordo Mass.