I don't think test cricket is better when either side is dominant due to conditions.Test cricket for me is always far better when bowlers dominate
I'd probably prefer a slight favour to the bowlers, test cricket shouldn't be easy for batting, but not a dominant sway to the bowlers.
If it's a fairly balanced pitch but one bowler is ridiculous dominant that's one thing, as can be the same when a batter puts together a brilliantly dominant innings, but as a broad stroke bowlers being dominant, no that's too much.