Agreeing with darimund, it depends on what else you are running. If you are running 2 other Team powers one of the three Teams will always be on cool down. When I was team PvPing I ran one each of the Teams though, so that I could throw the appropriate heal to teammates as necessary.
I find in some builds that running a sci team AND TSS is very effective at keeping shields up and certain aggravations (like AMS and jam sensors) at bay.
Again, it depends on what else you have going on in your overall build.
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Depends on the mission, for example, Hive Onslaught... the Borg Queen throws a lot of Sci attacks like subnuc... Science Team clears those attacks and gives you a large shield heal, so you share a cool down with TT but you get a decent heal outa of it especially if the Aux power is up.
And you can use Science Team on you or a team mate.
I'm running a science ship without Tac Team. I generally have both TSS and ST but I'm really torn between which of the two is better to have at a higher level. I appreciate the HUGE and constant instant boost that ST3 with the right DOFFs gives you, but that TSS3 reduction to shield damage is not to be scoffed at.
generally most folks run with 2 tac teams. any time you use a "team" ability, it puts the rest on cool down for 15 secs. TSS3 would be unaffected by this.
I doubled up on ranks II and III of engineering team, and extend shields with 2x shield transfer strength I AND 1x science team II on my star cruiser. I can use one of each of them to restore a friendly target on one pass. However on my science vessel: Shield transfer strength does share a cool down with feedback pulse But all of the shared cool downs are only half the time.
Sci team clashes with tact team, and while its a large shield heal to all facings, its a singular heal, if your in pve/pvp where you shield facing can be blown away in an instant you ideally want a tact team to fix that quickly, while sci team does heal sci debuffs... i would personally run TSS3 and possibly a lower level sci team depending on the build/ship/doffs of course
[Combat (Self)] Your Bite deals 2378 (1475) Physical Damage(Critical) to Spawnmother.