Looking back over my order history, my family has a couple each of Tom Bihn mask styles V2 and V3, and we've just all tried on a V4, V5 (this one), and V6. Different family members prefer different styles, so, unfortunately, I can't say there's one best mask for everyone.
Version V5 is the favorite of 3/5 in my house. If you liked V2, you will probably also like V5 for its fit. I prefer it for my family because if has those added filtration layers.
I agree with an article I read recently that Americans should not be wearing poor quality, homemade masks any longer, but I disagree with that article's author that disposable surgical masks are the best solution. I think we need excellent washable/re-wearable masks AND A SYSTEM BY WHICH TO COMPARE EFFECTIVENESS for non-medical products (like this V5 mask) on the market.
For my face--female, with a prominent, beak-y nose, yet a narrow chin--the S/M in V2-V5 feels just a little too small, yet the larger M/L mask "poked me in the eyes" (i.e., too tall top to bottom.) V6 in the smaller size is a better choice for someone like me. If you felt "between sizes" in a prior TB mask, skip the V5.
Overall, in my household, three people prefer V2/V5 styles like this (I'd call them TB's "minimal masks"), one prefers the V3/V4 ("greater volume" styles but similarly sized), and I'm the outlier with a strong preference for V6.