He projects for a better batting average over a full season; not on a game to game basis you dolt. He makes less contact. He's slow as s***. He hits a ton of balls on the ground that are auto-outs. Teams shift against him which means that even when he does hit it well, its often right at someone and therefore an auto out. That is why Morales is a terrible pick on a one-game basis.
The Carrera pick does make sense, absolutely. Doesn't walk. High contact rate. Top of the order so extra at bat. Decent legs so he can gain lucky hits on poor contact. Good pitching matchup against a pitcher who isn't wild and who doesn't rack up a lot of strikeouts.
Like I said; go play and pick Trout/Goldschmidt/Zimmerman/whatever every day and see how long your streak lasts; it won't be as long as you expect it to. I don't even gamble on these things but I know that the guys who are good at it do so by making ODD picks, not by making the most obvious picks. There is luck involved, but to be good on sports betting equals being able to make calls beyond rudimentary analysis.