What is the difference in activating with lemon or citric acid?

I started with lemon and then went to citric. The colour was stronger so was the smell and taste. Just wondering if the whole activation is less with lemon, which I am now back to as I don't want to be drinking citric acid twice a day (bladder, ph etc) I know JH seems to prefer citric and even says the activation is stronger. And what about lime is that better than lemon?!
Thanks Tweet