What color ties?

I think it’s your own personal preference! I would probably have the groomsmen coordinate with the bridesmaids and have them in ombré as well. My fiancé will be wearing a white tie so he’s a little different and matches me.

I agree, a white or grey tie for your guy, and a shade for the GM

It's all a matter of preference, but I would go with a different color. I feel like when the colors match it looks a little "prom" - but that's my opinion.

Another vote for white for your groom, and ombre ties for the groomsmen - or just pick whichever colour of the dresses you like best/is the colour you'd like to be most prominent of your theme, and have them all in that?

We also did bridesmaids in different shades of the same color (blue instead of pink) and just matched the groomsmen's ties to the bridesmaid's dress color that they'd be walking with. We chose another shade of blue for H (darker than all the groomsmen's colors).

I have very similar colors - Desert rose, vintage mauve and dusty rose from Azazie. My MOH is going to be in desert rose so my FH is going to match his tie with that (he wants a color tie, not white) and the groomsmen will have a tie somewhere between vintage mauve and dusty rose since there are more groomsmen than BM and they are pretty close in color. My only issue is finding ties that match those colors since they aren't super common and 'dusty rose' is slightly different everywhere you look. I think it comes down to personal preference and each option you listed would look great!