/\ This, they're not really in the same league but both have their charms.
Don't know what your situation is regarding neighbors, but the 2240 is LOUD. However you can put a mod on it easy enough. The HW45 is less obnoxious for back garden shooting, and as above the better pistol. You can spend well in excess of the price of a 2nd hand HW45 on buying and modding a 2240. I shudder to think what mine has cost me...
By all means if you like to tinker 2240s are great, an end in itself really, but as above I have not found them to be recoiless either - as well as the muzzle flip, the weighty hammer seems to play a part too. When modding mine I gained as much efficiency as possible elsewhere so that I could lighten the hammer spring. All a bit pointless now it's got a stock on it but hey ho
The famed hold sensitivity of the HW45 is much overstated IMO. As long as you don't hold it any-old-how, they are not difficult to shoot.