Hi Marc,
As Matt mentioned, on our trip down to Southern Oman we had plenty success with Pencil poppers and Skipjacks.
We tended to find a trend in the way the fish bit, in the morning sessions the fish tended to favour pencils and Skipjacks, but thats not saying they would not bite on them at other times of the day, we just found them to work a bit better during this time.
Another thing that was noticed is that the fish tended to respond better to certain lures during the certain times of the day ie. when things went quiet the GT's tended to be more willing to smash a BIG stickbait worked on the surface and then there would be times were they would react better to a nice big chugger !
The nice part of the Skipjack is it casts well and allows you to cover alot of water with a good amount of action (hence it working better when the water was calm in the mornings). It is also relatively cheap compared to all the other Pencil type poppers. Its also easy to fish it out of the bucket.
I dont think the colour played too much role in the strikes, it was more the action across a larger area then anything else or at least i think so
Ive attached a few pics of whats left of a Skipjack which my good mate Matt kindly donated to me after i had lost my last Skipjack
Tight lines