I would have to say that the Pearson is more of a sailboat then the Irwin. But the Irwin has more comfort then the Pearson.
Also be aware the Irwin was built as a affordable boat for the not so rich. So some of them aren't exactly as sound as you would wish.
Good luck
E.
http://pearsoninfo.net/index.cfm
http://www.irwinyachts.com/