Citrus all the way, any sort, but it has to be citrus... I'll except vanilla though. At the end of the day chocolate is overly hyped because everything insists on taking a level dip into it, but after the first few levels its really not worth it. Strawberry is okay but its pretty underpar overall, it can be made okay with a few overpowered feats, but anything reliant on that method clearly isn't worth it on its own. Citrus has a better mechanic and integrates well with other flavour a lot of the time, while vanilla is a good base for a lot of prestige classes so I'll accept it as a valid option.