I rather enjoyed my Julii campaigns the most.
My very first one, I had very little revenue on VH/VH going through Gaul. It took me a long time to conquer the province, but it was challenging and I really enjoyed it.

The second campaign i ever did with the Julii was different in that I loaded all my troops on them barges and sailed up to Greece and its riches. I prevented my fellow romans from getting those riches and managed to defeat the Greeks by siding with the Macedonians. And then eradicated the Macedonian armies...
with the money you get from that part of the world, your conquests are a lot easier from then on.

I never really enjoyed playing the Brutii.
I found the Scippii too easy.