I have not eaten a butternut with appreaciably better flavor than the Waltham. Productivity, size of fruit, and space requirement of vines are major differences. While all butternuts can be used as summer squash, the Trombocino is routinely grown for that purpose. Neck Pumpkins are somewhat similar to The Tahitian. Both are are large with curved necks. Butterbush is one the few that have the bush vines similar to a summer squash. About half the size of a Waltham fruit. The others on your list are pretty satndard in size a nd shape. If you have trouble with PM then PM resistance is invaluable.

Here is a link that might be useful: List of butternuts

Thank you so much for your input.
I guess you grow Waltham, too.

PM is not so much a problem but I do have problems
dares and small animals eating my crop.