Pearson 303, P30, Flyer
The P-30 is much more performance oriented than the 303 with enough room for some cruising. The P-303 was designed pretty much for cruising. The 303 displaces about 2,000 lbs more than the P-30, and has much better accommodations down below. So as you might expect, the 30 is better under sail of the two.
As already stated, the Flyer is different yet. For example, it displaces about 2,000 lbs less than the P-30 but the sail area of the two is nearly equal.