Anything that helps you lose less, has to be considered. But don't expect to win in the longrun.
The edge we have in Horseracing VS. Roulette, is that we have different odds for each horse, some of those odds offered are more than they should be.
Roulette however offers the same odds for each number (straight out).
Many times even the bookies and general public get it wrong, and that's why it is possible to win at horseracing in the longrun.
But it isn't easy.