I suggest you use the largest tiles with the fewest grout lines to maintain as possible.

Post the bath as now in a picture that includes the flooring that must remain.

Know this: A well ventilated bath cleaned weekly makes grout grunge a non issue.

Two inch hex, one inch, makes no difference.

Show what you have in a comment box. The whole thing, and your plan for materials beyond what tile size to use.

IMO 5x5 is too small for wall tile and also quite a dated look I personally do not like hex tiles but if you must then the larger one . So many grout lines too bad.

Squares and hexagons are classic and could be completely appropriate for this home depending on its age. Listen to Diana.

5" is the "new" four inch. No not "dated". I'll stop there.....................

I would do the two inch hex. Small enough for grip, but not nearly as many groutlines as 1".

I don't think medium square tile is dated for the walls either, 5" is fine, it's a classic look. And there is a big enough difference between the 5" square and 2" for scale.

For whatever reason, in the slightly pillowed form, where I live 2" was more common than 1". If you were doing a completely flat rectified hex, 1" was the more common one. This probably varies by location.

My prediction is that hex tile will become dated rather quickly since everyone seems to be using it.

Are those really 5" tiles or are they 4-1/4" 4-1/2"?

I have two showers in the old format you have and it's 2x2" porcelain.

Be careful w the 2” hex. We used it once in a shower and even though it was matte it was surprisingly slippery when wet. The grout with the smaller scale actually helps make it more nonslip. Good advice for all to see what you are doing for other finishes in the main room.

What type of tile do you have outside of the shower? It might be best to just make sure they work together.

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LiLu Interiors I'm betting that this OP decided on tile 4 months ago. Your late-to-the-party posts might be considered SPAM by other Pros.

If you want to put in your 2 cents, then comment on posts that are currently being debated.

I don't see anything resembling spam in Lilu Interiors' post. Sometimes the dates are just not noticed.

Sometimes pros revive old posts just to post pics of their work with no real advice to the OP or it's been so long that the OP decision is likely made long ago. So it reads as self promoting spam.

Perhaps she didn't NOTICE the the original post date.

Agree with @JAN MOYER. Houzz posts "more discussions' to the right of all discussions. Clicking and commenting on one of those without checking the date is an easy error.

Oh, those evil Pros, always going on the DDs to get business.

lol.........really.