Garthanos
Arcadian Knight
Either can trip though there is your thought on it helps both coming back. Now trips in a team environment are edgy because they can make several follow ups with advantage if you are only talking personal output however? so at low level you are using either two attacks without advantage or one attack with advantage.In all honesty a way to get an extra attack probably helps the battlemaster more - as he can tie it into a trip attack round to also grant that attack advantage.