I always use Brand in solo mono tactics decks. He has the best WP/threat ratio together with Elladan and I use him as my tactics quester. Unlike Elladan he also shines when we have the battle and siege keyword. Very flexible one-trick pony.
I rarely use Hama and Imrahil. Hama isn't bad, but the other tactics heroes are that much better. Unlike Legolas he doesn't help you at all when you're stuck with locations. Otherwise he's basically the Book of Eldacar with legs. I think I haven't played him in ages. Imrahil sometimes entersnmy decks, but mostly because I was building Gondor themed decks.
So yep, for me it is Hama.