Zowie all the way.
Personally I prefer the Zowie EC series over the fk because it feels more like the deathadder.

I've had a good experience with the Deathadder, though about 2.5 years in to using it, it developed a bug where it would sometimes register a left click as a double click. Also, it has rubber side grips, which I know some people don't like.

G303 is great. I know people give it a lot of shit about its shape, but it was nowhere near as bad as people had made it out to be.

I tried using a deathadder after having a rival but it was too small for me to grip, so if you have large hands keep that in mind when comparing things to the rival as it is one of the longest mice on the market.

that's weird, my old deathadder did the same exact thing so i had to throw it out

I heard about the right click thing wasnt the fix to put cardboard under it ?

Gonna go with the G303 thank you everyone

In my opinion, getting the G303 isn't the smartest decision as this mice is considerably smaller than the ones you've already used. It's also about finding a mice that will make you feel comfortable in game, and in terms of weight, size and shape the G303 is nothing like the Rival or the G400(S), so it's up to you if you want to take the risk and possibly like the G303 or not.

You might as well consider getting a Zowie EC1-A, really good mouse for palm grips users with large hands, EC2-A if you have smaller hands or if you simply want to have more control over your mouse.

Well the g400s and the rival are super big and i just put up with them overall i like smaller mice

Alright, then try the Zowie EC2-A if you use palm grip, FK2 for claw grip. I've heard really good things about the G303 but be careful about the shape because some people in the end just can't get used to it, so it's up to you whether you want to get it or not.
The Deathadder is a quite big mouse, so may as well just put it aside. There's also the Ninox Aurora, it's an incredibly light mouse, I've used it for almost a year now and it's still working pretty good. It does look really cheap though, that's the biggest concern I have about my Aurora, also the fact that you can't mess with the drivers too much as it caused some people to just break the mouse's sensor (lel).

So in a nutshell : EC2-A / FK2 / Ninox Aurora (great quality-price ratio but don't mess too much with the drivers) / G303 if you are really certain you want it / Razer Abyssus ?

Okay thank you! Im going to go to my local store that has a DA and G303 and test the sizes overall I dont palm or claw grip I have a weird hybrid

Alright then, I hope you'll find what you're looking for :)

ZA series. The ZA12 is the most similar in size to the fk2.

Just want to let everyone know that Razer will send you a new Deathadder for free if you send them your broken one.

g303 has the best clicks known to man. iunno about zowie outside of the fk series, but the g303 is worth getting solely for the clickies. it actually makes a huge difference being able to click so fast.
it beats out the g400s, DA, fk1, fk2, and abyssus i can tell u that much
A con i guess is that my push to talk is on a side button and im frequently told im holding it down when i dont even notice

I'm currently using the deathadder, honestly i think it's a great mouse, been using it for 3 years now, no problem so far, It feels really good and the grip is strong imo

wait i didnt know about this ima look this up

edit: shit theres a warranty period and im way past it

I also own a ZA12, amazing mouse, very comfortable and doesn't get sticky or annoying in the summer when hands are sweaty (and spaghetti) my hands are 19.5 cm long and it's a perfect fit

i use deathadder and have had no problems with it in the 2 years i've had it. still works fine but it's the only gaming mouse i've ever used so i may be in the dark.