Ancelotti for me has been the most impressive.
He was the best choice for me. Come in. Steadied the ship without even changing much and has given new fresh life to a team which was heavily underachieving.
Jose is getting results for now but is causing issues with his usual lack of any style, defensive, counter attack only football and short term plans neglecting some big long term issues. Spurs fans aren't happy with him overall. Spurs, sad to say it are still better than us, have a better squad and more than enough to get top 4 in this truly poverty league. Jose don't worry me at all though. He won't last long down the lane.
Arteta is a rookie with a monumental task and he's done ok, with his failings down to expected inexperience with an unbalanced average squad. He should be looked at much more when given a full pre season. I just hope he doesn't screw up before we even get to pre season.