I started with closed guard.
For a long time the only move I could really hit was the overhook triangle. I've also developed the armdrag closed guard to some extent.
I would say closed guard is one of my stronger guards.
I also started to develop a half-guard game because I was ending up there a lot (14/15 year old in the adult class).
Would use deep half as an escape a lot.
A lot of my passing is over/under type passing because I used to play that game.
For a long time it was my A game, but now I only really play it in no-gi or if they are trying to pass on both knees.
I'm starting to look at the Z-guard again because of Craig Jones, but haven't really implemented anything.
I also avoid deep half now, and prefer the Lucas Liete type half.
In the gi I play a cross grip looking to invert/drag/triangle if they are trying to pass on both knees.
I started to get into SLX/X and shin to shin (Marcelo's influence), to deal with people who were standing.
I think naturally I started to play a lot of sit up, with the hand in the collar, which led to me playing a lot of collar and sleeve.
I use Collar and Sleeve and transition to DLR (if I can't catch a triangle/omoplata), then look to: sit up to a single/ball and chain, go to X/SLX, and shoot Omoplatas/Triangles.
I haven't developed the whole berimbolo style, but I feel that if I did I'd be able to catch a lot more people...
I think it boils down to:
Standing: Collar-Sleeve/Shin to Shin -> going to SLX or Singles, and Triangles
Both Knees Down: Cross grip/Roleta style guard looking for Triangles/Arm drag or Z-guard looking to get the underhook