Isn't this more about what serves you do well and what serves give you an edge against a specific opponent?
Certain serves will set you up well vs one player while another player will eat those same serves for lunch. So serving, in the end, is about reading your opponent and pulling out the serves which help you against that specific player.
Which also means, it is worth practicing all spin variations on serves:
1) Direct backspin
a) varying amount of spin, light, mid, heavy
2) Direct topspin
a) a) varying amount of spin, light, mid, heavy
3) Sidespin that curves right to left:
a) straight side spin
b) side/backspin
c) side/topspin
d) varying the amount of spin with all of the above: light, medium, heavy
e) no-spin with same motion (no spin could ultra-light backspin or no-spin which, after the second bounce will be ultra-light topspin).
4) Sidespin that curves left to right:
a) straight side spin
b) side/backspin
c) side/topspin
d) varying the amount of spin with all of the above: light, medium, heavy
e) no-spin with same motion (no spin could ultra-light backspin or no-spin which, after the second bounce will be ultra-light topspin).
5) Corkscrew:
a) with this I would only use medium or heavy. The ideal with corkscrew is to make it look like one of the other sidespin serves. Because, if it is true corkscrew, one side of the ball will be backspin and the other side of the ball will be topspin. If it looks like a sidespin that curves when it is really a sidespin that kicks to the side, you get a lot of misreading of the serve.
With the regular versions of sidespin, being able to vary things like the axis of spin helps you get misreads of the serve as well. So, more side than top, more top than side, more back than side, more side than back.
In my opinion, which versions of the serves don't matter that much. Like, a BH serve, a hook or tomahawk serve or a reverse pendulum serve can all be used to give you the sidespin that curves right to left (from the receiver's perspective, spin that curves towards the FH side of the table).
There are BH serves, and reverse tomahawk serves that give spin from left to right (from the receiver's perspective, serves that curve towards the BH side of the table) but the easiest serve I know of for creating that kind of sidespin is a traditional pendulum serve.
But it is worth being able to create all or as many of those spin variations as possible, so that, when you are facing an opponent, you can go through a variety and see which serves your opponent has more trouble with and which serves give you more of an edge on your third ball.
From that standpoint, I don't really think it matters what kind of rubber you have on your racket. It just matters that you have a backspin serve, a topspin serve, a serve that allows you to create the first sidespin (then you need to learn how to make it more top, more backspin, or more side so you have variation of that specific serve) and a serve that allows you to create the second sidespin.
Corkscrew is more complicated. But if you can figure out how to create a corkscrew serve, then you will understand its value.
A corkscrew is spinning like a football spiral and will fly straight but when it bounces it will kick to one side or the other. So Adam Bobrow's snake shots are corkscrew lobs.
It is also interesting that often low level players will have no trouble with corkscrew serves because the axis is front to back so if the hit the ball directly in the back it will feel like a no spin ball. The value of the corkscrew is when the opponent cannot see that it is not a regular sidespin and tries to return it as if it is a regular sidespin.
Anyway, the short answer is, practice all serves, see which ones you are most comfortable with. And then, in matches, learn to read your opponent to see which serves work best on him/her.