As said days ago, I've done both and done pretty well in both. I have to agree with Rapier, if you think you are so much better, it seems at everything, I could understand how the interview went badly.
I know soldiers and officers who have tried to get into the police and failed. Some "well educated" Officers even failed the entrance test! The thing is, it is a tough process to get through and not everyone gets it first time. Those that want it go away, reflect and try again, hopefully not making the same mistakes.
If you really want to join the Police think about the feedback you got, take it on board and try again. If it means you mention the shifts, hours & pay, etc as being causes of concern then that's what you have to do next time. Anyone with such a distinguished military career should be more than capable of "playing the game". If you can't do it at the interview then perhaps the police isn't for you as you will have to carry on playin that game for the rest of your police career.
The only person saying one job is harder than the other is you. Those who have done both seem to suggest both have their challenges. There are very few police officers I would want to take with me on a Platoon Attack, but at the same time there are very few soldiers who I would want to do the prosecution file for the thug that murdered my Granny etc. Most soldiers I know, especially experienced SNCO's, would make good cops but very few cops would make good soldiers. This doesn't make one harder than the other, they are just different.
I know of plenty of junior NCO's/soldiers in their early 20's who could barely manage their money until the end of the month, let alone deal with several investigations at once, interview the witnesses and submit files on time.
A good soldier won't always make a good cop, and very few cops would make good soldiers.
As for pursuit driving, train hard, fight easy doesn't really apply. I've never been involved in a training exercise that is anywhere near as risky as a real life pursuit. That's why in my force, although Civvies (all experienced instructors, some DDI) can instruct on standard and advanced courses, they are not involved in pursuit courses as they simply don't have the experience. I know some military units are "advanced" trained but doubt any of these courses involve 8 weeks of solid driving.
I've done a 4 week standard response driving course that would probably be seen as advanced driving in the army and similar to that on EOD courses. I've then done a further 4 weeks police advanced course, another 7 days on initial pursuit and then Tactical Pursuit and an ARV course covering vehicle drills and anti ambush training, and get to practise these skills most days. If you have served in one of the 3 units that would have similar levels of training, fair play, but you aren't now so get your head around being a Police officer.