I purchased all three...
ESPN has a nice insert of the top 304 prospects ranked from 1 to 304. They have brief breakdowns of each player's strengths and weaknesses...and the format is not reader friendly, IMO...and there's no mock draft, just suggestions for each team.
Lindy's is significantly better, IMO...offering positives, negatives and "in our view" comments, presented in a far more attractive format...a two round mock draft...and at each position they rank the top players at six different categoreis...for example for CBs: (1) Read and React: Leon Hall (and they give the reasons); (2) Coverage: Darrelle Revis; (3) Closing/Recovery: Aaron Ross; (4) Run Support: Tanard Jackson; (5) Top Playmaker: Daymeion Hughes; (6) Intangibles: A.J. Davis...and then...at each position they offer "3 To Watch"...for CBs: (1) Sleeper: Eric Wright, UNLV; (2) Could Disappoint: Marcus McCauley, Fresno St.; (3) Small school Stud: Tavarous Bain, Hampton...with reasons why.
Pro Football Weekly has an excellent format...and I would rate it the most informative of the three...each of the top 8 players at each position has his picture (head shot) to go with detailed descriptions of "upside, downside and The Way We See It"...and...they offer a statistics grid of all three or four years of the player's college stats...
The thing is about PFW...the evaluators are so critical of the players that after you read the blurbs, you don't want to draft anyone! I am not kidding. For example...although Joe Thomas is their number one rated OT, his "downside blurb" is twice the size of his "upside" blurb...and they say things like: "shows no killer instinct...is narrow waisted and short-armed...can be lazy with his hands...not a great finisher and rarely buries anyone...not nasty and too often looks content doing just enough to get the job done."
After reading this...(if you believe it)...and I must say, after focussing on Thomas a few times this year, from what I saw I would have to concur with everything they said...there is NO way you'd want to go near this guy with the #5 pick...but...for some reason they still have him ranked number one, even though they are much more praising of Levi Brown, saying, "not as nimble-footed as D'Brickashaw Ferguson or Alex Barron, but he is more physical and plays with more power...Footwork is easily correctible, but will require some patience. He has all the ability teams seek in a front line tackle."