So, in short term, betting on small odds is better. Because it causes you to play for a longer time (especially when you have not a big bankroll)
In long term, there is no difference. (Those gamblers who play for long term usually have big bankrolls and can afford to lose even more than 20 times in a row)
you said short term ? short terms means you play for a short period of time so your supposed to bet on higher odds so that you can win or loss quickly but betting in smaller odds is indeed good for smaller bankrolls so that you can minimize your chance of loosing but itll make you also play longer . loosing 20 times in a row can be acceptable or not depending on your bets . i can play longer but i dont have a big bankroll , its only a matter of bankroll management .