Just my 2 cents, but having played both Appplebrook and Tallgrass, I'd say this:
Tallgrass isn't overly long, and there are some nice features out there, some nice variety and a chance to hit alot of different shots. Tallgrass doesn't really beat you up at all, it's a course to go have fun for a day in a place (Long Island) where there is not much public golf. Top 100 course, I don't think so, but I don't think that was the objective of the developer.
I don't know why Applebrook doesn't receive more consideration for top 100 by any of the Golf Magazines. It's a fun, sporty course with alot of challenging holes. If I had to offer a criticism (on a scale of 1-10, this would be a 2), I'd say that #1 and # 10 could be longer, and I've always thought 2 of the par 3s (#5 and #17) seemed a bit too similar. #7, 8, 9, 11, 13, 14, 15, 16 and 18 are great holes that really challenge you. Some pretty good short par 4s in #2, #3 and #12 too.