There are two questions here; first "moving in oil" and comparison of the Terminator and the Black Pearl ... I'll try to answer as best that I can, based upon my own personal experiences and also from what I've learned in chats with Galen Gentry at Legends.
First, getting any ball to "move" in heavy oil is tough; proper speed, lane alignment and line play, and hand position are most important to achieve results. That being said, IMHO the Big Bang, World Class particle, and the Terminator will most likely give you the best look for those conditions, with the Guaranteed and AP2 falling next in line. Note: the Yeah Baby was their heaviset load particle when it came out, but more recent releases have exceeded the YB in that regard.
Next(and this has been covered in this forum before) the Terminator is a dual-load and polished particle ball that handles a surprising volume of oil for a polished ball; the Black Pearl, which is a particle pearl and shares the same core as the NS and NS2, goes longer and has the potential for a more pronounced backend reaction due to the core/coverstock combo.
As with any ball that you choose to use, the number one factor that affects ball reaction is SURFACE ... and these "L/LM" balls REALLY take to coverstock adjustments, so don't be afraid to try different grits and polished/no polish combination to get the reaction that you are looking for. The next factor is the core, followed by layout, then lastly static weights. Static weights is where the placement of a balance hole comes into play and where you can "tweak" or fine-tune a ball's reaction a bit more.
In closing, although there are a few roomies in here that have a wealth of experience and knowledge, I'd strongly recommend a chat with the Legends "guru", Galen Gentry in Stockton, CA for his advise and input or Pat Duggan at BowlingBallMall ... they LOVES to help !!!
galen@lanemasters.com OR 1(888)526-3645 (8-5 Pacific Time)
pat@bowlingballmall.com OR 1(405) 282-2695 (Central Time)
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**** Official "L/LM ball junkie" ****
Man, I LOVE this game; and I love it even more now that I'm using LEGENDS/LaneMasters equipment !!!
"Master the Lanes with Legendary hitting power" !!!
Robb in O'Fallon, IL 62269 (near Scott AFB)
LAYBZZ74@AOL.COM (Email and PayPal addy)