Best sealant/caulk waterproof?

today- noticed a pool of water near my garage wall.  had the floor area sealed-about 9 years ago...and now want to do myself to save some $$.  I guess I will chip out the old caulk and then add new.  Question- best sealant/caulk-repel water and seal well? Thanks!  Any advice appreciated- I've gotten some great answers on this site!  pix added!

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