Be consistent, and don't compare odds to chances; hence, use 'chances' in (1). I believe the sentences are correct. I'm not quite sure about that 'my chances / those' combination in the second, but I think it is technically correct. However, it sounds a bit like you are comparing two different things: your (individual) chances of winning and the (general) chances of losing. Therefore I like the first better.
Note that there is a subtle difference between chances and odds: 'odds' represent a ratio of probability, such as 3:1 (three to one; out of 4 times it will happen 3 times and one time not), while 'chances' represent a direct probability, such as 75%, which equals 3:1 odds.
In gambling, the pay-outs are usually given in odds (3:1 means that for every coin you bet, three will be returned to you in case you win). The chances of winning are usually lower.