Hmm. 1911 is my favorite but other than that here are my limited experiences
Glocks, I had a glock model 20 full size 10mm and liked it, I just couldn't shoot it worth a crap, even after about 400rds. I have fired about 10 different models of glocks, and have come to the conclusion that I don't like them. I hate their grip and ergonomics and trigger and feel and looks and everything about them, they are however really good guns, if you like em and shoot em well, give them a try. I would opt for gen 3 over gen 4
S&W M&Ps, I had an M&P40 and I liked many many things about the gun but I had to sell it. The ergonomics were great and I think to this day that it has the best feeling grip of any semi auto short of an HK P30. I loved the looks of the gun, I liked the stock sights, and the it seemed like a well built solid striker fired gun. The polymer used felt much stronger and thicker than glock polymer. However my particular gun had a HORRIBLE trigger, and I mean really really bad. After about 400 rds it never got better. The trigger was the grittiest crappiest feeling trigger I've ever felt on any gun , nerf, airsoft, paintball, pellet/bb, and firearms. Not only was the feel of the trigger really bad but it actually would cause the tip of my finger to be rubbed raw after only about 30rds. It's too bad, I really liked everything else but I didn't want to spend any extra money on trigger upgrades, and didn't want to be without a pistol sending it to S&W.
I had a ruger gp100 6" .357 and liked it (vvery front heavy) until after firing only about 100rds a buddy short stroked the trigger and locked the gun up. I believe it to be a flaw in the design. A couple minutes later I got the revolver to free up but I was afraid to shoot it double action and didn't trust it for woods carry
I have also owned a couple of military surplus pistols (cz52 and tokarev) but they really aren't worth your time especially since all of the surplus 7.62x25 has dried up. And the Romanian tokarev had terrible accuracy.
H&Ks, my brother has a vp9, which is their cheapest model and is also striker fired. I have handled it some and shot about 8rds through it. It feels really nice in the hand and has adjustable backstraps AS WELL AS swapable side grip plates, you really can make the sucker fit your hand. It feels well made but I really hate the lever style mag release at the bottom of trigger gaurd. The trigger pull is very light, but long and overall not quite as nice as the PPQ, but better than glock/M&P
The P30 has a rrrrrreally nice grip, and is hammer fired DA/SA, but I have only ever seen LEM versions (Law enforcement model) and in SA their triggers are smooth and light but very very long. I have handled USPs and found their grips too fat for me, and don't like polygonal rifling.
I came really close to buying a .40 sig sp2022 but the grip was just MUCH too fat. Like holding onto the top portion of a baseball bat (not nearly that fat, but fat)
I now own a Springfield loaded model 1911 .45 parkerized with tritium sights and a Walther ppq .40 m2
Walther PPQ, excellent striker fired gun. The grip is very ergonomic, the gun feels very well made, and has the nicest trigger of any striker fired gun I've ever shot/dry fired. I only have about 200-250rds through the .40 PPQ and I am not nearly as accurate with it as my 1911, but I am getting better and better as I shoot it more. It has qualities that I don't like common to all striker guns, and is rather low capacity for a striker double stack gun, but I really like it. More than any glock I've shot and more than any M&p I've shot.
If I had more money I would rrrreally like a cz75 in .40, a browning Hi power in .40, and a 10mm 1911. As you can tell I don't really like 9mm that much, and prefer steel DA/SA, but most striker guns are really nice and accurate and reliable
I really hate magazine disconnects and fat chunky grips (sig sp2022)
Walther has a lifetime warranty to the original purchaser, as does Springfield Armory, and I think S&W might too.