RF antenna WiFi Ceramic Chip antenna very experienced individual for assistance

Hello there, So we have designed a WiFi module. The module however is very small and requires a chip antenna. We have in the past used an antenna that has worked out well, but now, that we're going to be making this in high volumes, want to consider alternative antennas and select the best one we can find for the best price possible. So we have selected a few, but they are hard to differentiate based on our limited knowledge by looking at the spec sheets. We are therefore looking for an individual that has worked extensively with antennas (preferably chip ceramic antennas) that can assist us with selection of the best antenna and will be able to explain why the selection and also answer some other related questions.