Which platform do we think is more reputable and have good track record of security? Does either of them have good liquidity?
First let's ask yourselves why you did not search?
Because with searching, you will get enough answers for the basic questions and won't have to ask them here. You can ask after doing your due diligent research and got some ideas. You can describe what you understood, what you did not and what you are confusing. Your topic is purely questioning without any signal that you already did your research.
CEXs usually have higher trading volume than DEXs but not all CEXs have higher trading volume than DEXs.