Mechanical all the way! I used to have a rubber dome, and I have owned a few mechanical keyboards. Mechanical keyboards are superior in a ton of ways: They are more comfy, they don't wear out as much, some give feedback when you press them, etc.
The only downsides are the price and features (for instance, I don't think there's a mech keyboard with a screen, but you can use Roccat Powergrid on your phone for that
)
Now, when you want to buy a mechanical keyboard, you first have to consider which switch you like. There are 4 common types: Blue, red, black and brown (all are Cerry MX). Blues are normally loved by typists as they give a satisfying click as you press them (some find this annoying). Browns are like blues, but without the click (you still feel some tactile feedback when pressing down on a key). Then the reds and blacks are both linear, making them perfect for shooters since you can double tap quite easily. The only difference between the blacks and the reds are how much force you have to apply before it goes down.
For more info:
http://www.keyboardco.com/blog/index.php/2012/12/an-introduction-to-cherry-mx-mechanical-switches/
I used to have reds, blues and I now have browns. I liked the reds, but I can see how someone can dislike them, seeing as they are often pressed accidentally (you get used to it though). The blues were very satisfying, but my mic kept picking up the clicks so I switched to browns, which I like very much. If you want to know what you would like, just go to a store and try some switches out
As for keyboards, Corsair would be a good brand, I love their build quality. The Razer keyboards switched to their own switches (no pun intended) instead of cherry mx so I wouldn't know about the switches. I had a Blackwidow though (they used to have cherry mx blue switches), but I didn't really like synapse and how some keys were painted. I now have a Logitech G710+ which I really like.
Corsair will be releasing the very first cherry mx RGB backlit keyboard, so if you like pretty colors, keep an eye out for that (I know I will
)
I also heard good stuff about Ducky keyboards, but they don't sell those here I beleive so I never got one.
So yeah, switch to mechanical, you won't regret it
