I think both have a significant chance to develop into a decent #1 WR. Not, certainly, at Moss' level, but a decent #1 for with TFB throwing to them. Neither is likely to contribute a huge amount this season (for different reasons), at least not till later. HOWEVER, with the signing of Holt, still a legit #3 guy (finally!), the Pats may now have the luxury of taking someone with high-upside potential who may not contribute immediately. AND, there will be other decnet #3/possession guys - with limited upside but maybe a better chance to contribute immediately - available in later rounds (Roberts, Price, White, Jeremy Williams, etc.). And, again, there may be even better "project" prospects available in 2011 with one of our TWO 1st-rounders.
IOW, I'd probably be okay with either, as far as WR goes. OTOH, with positions at DE, OLB, RB and (possibly) O-line yet to be filled, it may be better to skip "project" WRs altogether, use our remaining higher picks on those other needs, and pick up one (or two) of those possession guys later.