Best Theme For Migrating Drupal 7 Site Built on Jollyness Theme?

Hi,

We have a Drupal 7 site built on the Jollyness theme that we are planning to migrate to Drupal 8 / 9.

It's a relatively complex site with a lot of contibuted and custom modules. We use Domain Access extensively, but fortunately, we do not use Commerce.

I am currently evaluating the Drupal 8 theme, Benz which looks pretty good. However, I was wondering if there were any other DrupalExp themes that might be better for compatability with Drupal 9.

Thank you.

Cheers

Brett