I will take a stab at this, as I have used both. Popular belief was the bulk of the line was in the center mass of the spool, and they thought the Gyro effect from most of the line would help stabilize better and not try to pitch and pull as the cast was being made, when using the deep V-spools.
I still have some of the old Lew's BB-1N with the V spool. Never could tell any difference in performance. I preferred the standard spool, as I used the old Lew's to chunk deep cranks and the larger capacity helped achieve longer casts.
As you cast your baitcaster reels, just as you make the cast, roll your wrist to where you get the reel vertical as the line is running off the spool. It's a habit you would need to make yourself do. But the gyro effect is much more relaxed with the line running off our spools when they are vertical.
Give it a try, it's a little awkward at first but once you get the hang of it, it becomes second nature just as thumbing the spool as we get more use to the baitcaster reels. You will have your thumb roll to the inside as you make the cast, leaving the centerline of the spool vertical. The spool and line will run more freely like this too. Give it a try.