First, read this if you haven't:
viewtopic.php?f=95&t=18429If you don't go to tournaments anything is good except more than one UGE formation. The best UGE are Kults with Buggies and Skorchas. Even Gunzmobs can be good for Blitz Objective guard if you play an scenario with objectives or even for crazy things as the Ork list is the one that gives you the most freedom on lists with Space Marines second. As an example I played some weeks ago with a list full of Gunzmobs and was quite fun, and won with it also. If i remember well it was:
- 1 BIG Gunzmob with 2 Odd and 2 Nobz for BTS and for protecting the Warboss.
- 11 formations of Normal Gunzmobs
- 1 Normal Kult
- 2 Stormboyz
- 2 Normal Blitz
- 3 formations of Fightas
But this would go very bad on tournaments, is more for fun. Which gets me to the next point.
If you plan for tournaments, and want to win games in them:
- The more formations the better. Forget about BIG and UGE except for Kults and maybe a single BIG Blitz Brigade with 2 SoopaGunz. Even if they feel fragile. 10-12 formations is the minimum.
- Forget about upgrades except the Supa-Stompa, Fightas, and the extras to fill the landa.
- Put more Fightas and Kults. Speed is king in this game (that's why GunzMobs are worse options for most situations), and Fightas give you the very needed capacity to strike deeply that Orks lack.
- A Gargant or 3 Stompas + Supa-Stompa can be good too for having an sturdy BTS.