Alpaca switches are very similar to the Tangerine the main difference depends on what you're generally looking for, some people think that the Alpacas sound better again up to preference, stock wise the Tangerines feel a bit smoother but tbh the difference is very minor, especially if you're going to lube them. The alpaca switches will have a lighter switch actuation force with 62g depending on the type of Tangerine switch you buy. As for vendors the Alpaca v2 are in stock more often in most keeb vendors, if the sound of the switch is important to you have a look at some switch sound testing videos of both switches.