On my vintage track bike don't belong clipless pedals, but traditional cage models with toeclips and straps.
Choosing a set of Campagnolo cage pedals is not completely emotional, it's also very reasonable. No need to talk about bearing quality, because that's always superb if you choose Record. But Campagnolo Record pedals with steel cages are the only option, because the cages simply don't wear. All cheap pedals have aluminium cages and they wear out that quickly, that you need 1 or 2 pairs per season. Campagnolo steel pedals last for ages and longer.
The difference between Pista and Strada? That's pretty easy. They are the same, except for the part of the cage on the outside, near the dust cap. Strada pedals (for road use) have a continuous cage that goes around the dust cap. In criteriums, the cage may touch the pavement in sharp turns. The fact that the cage hits the streets prevents the dust cap from wearing or coming off. For some specialists, however, this is a reason to use Pista pedals in road races. They like fast turns and have enough guts to keep pedalling.
Pista pedals don't have this cage at the sides. In banked corners, these sides may hit against the track surface. I cannot confirm if this is really true, but it's a good explanation. Maybe only a good story and purely hypothetical, but for sure it makes Pista pedals more exclusive, thus increasing the price on Ebay. Of course, you can also take a pair of Strada pedals and cut & grind the sides (as many people did), but that's cheating.
