i dont even fully know how a p twin works. what is a p twin?
A straight-twin engine, also known as straight-two, inline-twin, vertical-twin, or parallel-twin is a two-cylinder piston engine which has its cylinders arranged side by side and its pistons connected to a common crankshaft. Compared to V-twins and flat-twins, straight-twins are more compact, simpler, and usually cheaper to make, but may generate more vibration during operation.
Basically the biggest difference is how smooth the ride is from what I can tell. Most companies use V-Twins.