FrogReaver
The most respectful and polite poster ever
This chart is based on Single Classed Fighters with Feats other than Grappler (grappler is the only feat in the SRD, so if they have a feat other than that then these are not SRD characters). Note I left off any fighter subclasses with less than 100 results total. I also left off unnamed fighter subclasses.
Overall Battlemaster slightly edges out champion here when looking at level 1-20 totals - which I think is more aligned to all our experiences than the earlier graphs showing champion being by far the most fighter subclass. I'm still a bit surprised champion is more popular than eldritch knight.
The other Fighter sublasses shown were all from later books. I'm honestly surprised to see Arcane Archer having slightly more entries here than Samurai. But also, there's a pay barrier to these classes - so without data that actually shows what content the character creator had access to at the time the character was originally created, i don't think we can do much better on subclass comparisons. Probably can safely compare PHB class subclasses though.