There are three types of treats for cats:
Natural (day-old chicks/feeding mice) - they can play and "hunt" with them before they are eaten. Hard treats can be put in activity balls, so the cat has something to play with when he is alone at home. The soft ones are good in connection with training the cat, they can be divided and made into smaller pieces, and they are quickly eaten.
When I choose treats, I prefer natural ones so that the cats use their instincts. If I use ready-made treats, I check the ingredients list that the protein content is animal and high - I choose grain-free, and not too many E-numbers... There are many different brands that are produced according to those standards Cosmo is an excellent