Default for me is protection primaries (including the arrow if it has some secondary speed) and defense/health sets. Speed/protection/defense/health secondaries. More speed secondaries the better as with most characters but there's quite a bit of TM gain on the team and not much daze beyond traya in the standard counter teams so he's not a high priority for a limited supply of fast mods.
When using droideka on the team don't worry too much about tenacity as you only really need it to prevent buff immunity/stun from bastila shan and most people will save that move to dispel/stun droideka. When using Wat on the team you'll want to consider a tenacity cross and 2x tenacity sets and some tenacity secondaries though as then you really have a reason for trying to resist bastila's buff immunity. No real need to tenacity in TB in my experience.