I have the k9-85's installed at home. With a cat and a smallish terrier ,
Fitted loads over the years. Not had any issues. As long as the cat can't get within about 1mtr of the sensor you should be fine.
Can't comment on the optex or texecom as we don't use them.
Nothing against texe we have a few on the cards,just installers preference.
Go with your gut feeling on the company don't just judge them on price.