Nothing wrong with a pine bench at all, a well designed and made one would see a teenager out and Paul's ethos of making woodworking realistically accessible to as many people as possible is admirable. He is also the first to recommend that those who can build their own bench should do so.
I've not seen one of Paul's benches in the flesh, but in fairness you're probably paying about the same rate for the time and labour involved, compare the prices of pine 4 x 2s and seasoned ash/oak in 6 x 6 and bigger!
Richard has taken a more 'in for a penny, in for a pound' approach and done everything as well / solidly / sturdily as humanly possible. I have used one of his benches and it was like the foundations of a cathedral. A Maguire will last for centuries, serving the last man as well as the first and like most things that are an exceptional example of their type, will quite probably increase in value over time.