Get yourself a real gun.... a sig.
But in reality, you are comparing very different guns, some are polymer, some are metal, some are SA only, and some are DA only. The P99 can be DA, DAO, or QA(semi-SA). You need to go to the range and rent the guns. Then choose the style you want(DA, SA, DA/SA), and then pick from manufacturers offering those guns. Try polymer framed guns(lighter, but more movement due to recoil) as well as metal framed guns(heavier, but less movement due to recoil).
How do they feel in your hands, and do you have any trouble with the position of the buttons/levers. After you are done, shop around and buy one of the make/model you have chosen.
If you already have other handguns, and are just getting the newer P99 to try something new, then go ahead. You can always sell it if you don't like it or grow bored with it.