these are two pretty different programs....i've never done PEKIP, but my friends who have - have either loved it or hated it. Perhaps you can observe one first? Gymboree is pretty standard around the world. I think though I might agree with Buckeroo - PEKIP first since your baby is only 6 months and Gymboree is very active and I think your child gets the most when they are crawling/walking around the equipment. Additionally, we did not chose Gymboree (chose Panda Junction instead) b/c it was mostly helpers so you might want to also take that into consideration. Panda Junction had a good balance of both mothers and helpers.