Just a bit of a personal Rant here... Dolphin won't do tabs on both sides of a split pane.
Scenario - I go to a folder, maybe Downloads... then I want to move some files around.
With Nemo (and I think Nautilus was the same) I could switch dual pane, then on the right pane I could go to T3/music and then open another tab for T4/Movies.
Then I could drag files from Downloads to the other pane and drop them in the tab...
With Nemo, you can open the new pane, but if you want T3 AND T4 over there, you can't... so you have to simply use Tabs on this side instead.
Kind of incomplete dual pane experience...
With Nemo, I could open Home AND Downloads in the left pane, then T3 AND T4 on the right.