The Grand National is the most popular race amongst non racing enthusiasts as well as the most studied race by UK racing geeks that produce hundreds of statistics ranging from the important to determine a possible winner to the totally irrelevant all the way to the controversial and totally unrelated to betting.
number of races during the season in preparation for the Grand National ( winning horses seem to need 3 or more races)
jumping ability, having a history of falling and/or unseating the jockey is an obvious no no at the Grand National (history = 2 or more career falls)
must have done well in certain races (3m+) and race tracks (Ayr, Cheltenham, Ascot, but also "minor" ones like Chepstow)
Everything considered, my ideal Grand National winner this year would have been Monbeg Dude, but his connections have passed on the race, so my selection is Teaforthree even though I don't like the odds (he was around 17.00 last night on Betfair, now down to 14.00).
If you like long shots I think
The Rainbow Hunter
Across The Bay
all have a chance to place and maybe even win
A particular mention for Becauseicouldntsee, one of the favorites in the last two editions of the Grand National and both times a faller. He has not win this season, but he's got more experience and the course and jumps are supposed to be easier this year. At odds of 120 (he was at 140 last night) is worth a shot.