3-ish and 5-ish ... that's maybe 80% probability that the drafted player will play at least 100 games. Or 65% that both of them will play 100 games. Probability of two impact players is considerably lower.
Mailloux-plus for 80% probability of 100+ NHL games? I would generally always take the prospect that has played at least a year since the draft, as the ceiling and floor are much more clear than for an 18yo.