Diabolos Chip is the most used especially if you don't have Goku Weight to partner any GT Chip with (Zan, Retsu, Gen, and possibly Sou are the alternatives still depending on what you need your combo to do). Spriggan/Diabolos2 on Goku might be similar to Diabolos in terms of weight and teeth as well as the dual-spinning compatibility with any Base that allows usage of Weights.
For the right spin exclusive Chips, most of the time it would be Odin/Achilles/Dragon2/Valkyrie/Joker/Ashura. The remaining right spin Chips so far don't have enough teeth strength to be able to really get into the meta list.
For the left spin exclusive Chips, it'll be rotating among Longinus/Bahamut/Fafnir (which is kind of a bummer since we have less and less variety now)
From what I can see as some sort of rule of thumb based on testing as well as observing the winning combos lists in WBO and local tournaments:
1. If you intend to use Dash Drivers, best to partner with Ashura or Bahamut (right and left spin, respectively) to utilize the numerous clicks allowed prior to Bursting as it proves to be superior to using tall-teethed Chips like Valkyrie and Longinus.
2. Attack-typed Chips work best with Stamina/Defense Drivers while Stamina and Defense-typed Chips benefit from Attack Drivers. Of course, this part still depends on what kind of Base you'd be using along with what role you need your combo to be on your deck.
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