SG1 for me. Couldn't even make it through the first season of B5.
If you havent heard this already i would suggest starting from season 2 of babylon 5 if you cant make it through the first season. The first season is slow but in season 2 after they got rid of all the bad characters it really got good and stayed that way unitil season 5. The best seasons are seasons 3 and 4.