I love hold'em. I love poker. I have no way of declaring what game is "easiest to win".
However, the most pure and readable game would be five card stud. Not played much these days. Games go in and out of style. In "The Cincinnati Kid", 5 card stud was the game. Edward G. Robinson against Steve McQueen, who draws to a Royal. Realistic? No way. But at the time, that was as popular as Hold'em is now.
Seven card stud has been the basic "kitchen table" game for as long as I can remember. Draw poker was the game before I was born. But I think I learned poker playing that when I was too young to even recall now. I know I was playing for money by 10.
Omaha and Hold'em seem better suited for casino's....lot's of hands, lots of rakes.
Believe it or not, I learned how to WIN at Hold'em from watching my son play on the computer when he was about 6 or 7. I had a very good simulation program, and I couldn't win at it. He was home with the chicken pox, and I stayed home with him. I taught him to play poker with a deck of cards...think probably 5 card stud, because of the simplicity..just wanted him to know what hands had what value. Then he got on the computer and kicked ass on the Hold'em simulation program. What I noticed was he did not play like me. He either raised or folded. He never called. He never passed. I tried it at a real table as soon as I could (we lived in Vegas at the time). It worked! Then I got too confident, and it did not work quite so well against better players. Not that the strategy was faulty....it's about your opponent's ability to read you as a player.
In the end, I would have to say the better players will win in any poker game. The skills cross over. I don't know if any game is "easier".
So I guess I should retract my opening statement....the easiest game to win in is the one that has the weakest players at the table.
I can say what "poker" game is the most
difficult to WIN at....beyond a doubt -- Caribbean Stud...the all time sucker casino game. (Not really poker, but they call it poker).
Peace,

Rs7