really, we see no evidence for disagreement between the two methods. there's some chatter recently about other, in-progress work, but here's a paper, with photometry to be made public upon publication.

we use well defined methods for measuring the TRGB, and we do so in F090W (~I-band), where the TRGB feature is very stable as a function of metallicity and age, unlike redder filters where its slope becomes difficult to pin down. you can clearly point it out, by eye even!