If its true and every suggests that Moyes will be gone, then Klopp would be the more logical replacement for the short/medium and long term.
When it was announced Moyes was going to replace Fergie, a lot of fans were guarded on the appointment but would certainly give him time to rebuild. A relatively poor start with the odd glimmer here and there. From December it just went from bad to worse. Illogical team selections, the constant love showered on Rooney with RVP taking second fiddle. What has got most Utd's fans backs up, probably more so than the results, is the manner of the results. Just not good enough.
At least Klopp has a reputation for being a bit of a fire brand maverick. He is an arrogant SoB which is what is needed for the job. He plays attacking football.
If we were to get him, I think he would be afforded a lot more time and patience then Moyes by the fact he plays good football from a solid foundation. Even this year when Dortmund have been hammered with injuries, the team have looked solid, they had a plan. When Bayern beat them in the first game before Xmas, two moments of brilliance separated the two teams despite a much depleted squad. By enlarge, we have had the same squad, added to it and looked clueless and without any direction or motivation whatsoever.
Van Gaal is the obvious safe choice but he would only steady the ship short term and bring his own baggage.
Interesting tweet from someone I know last night after the Everton Game, it's all about saving NEXT SEASON. I think he hit the nail on the head