Pkgbroswer is great for packages - not so great for discovering Applications - which of course may be made of many packages. Great if you know what you are doing and prefer a GUI to the command line, not so great if you are new and kicking the tires to see what is available. Tkpacman is similiar - great if you prefer to use a gui instead of pacman, not so great for other things like browsing. Both are solid. Best usecase for them as I see it would be if you spend most of your life in other distros and don’t have yay/pacman commands and options memorized. These programs allow you to do all those functions without knowing pacman’s syntax. Tkpacman doesn’t support AUR like Pamac and Octopi, nor does it support AppImage or flatpak. Of course, most of us here don’t like the bloat of AppImage and/or flatpak and prefer to use native packaging, but everyone has different needs and your might need/want them.
I do like both programs mentioned by ringo, and they are definitely more stable than some of the others that we have mentioned; I just don’t think they meet the need of the original questioner. One thing that tkpacman is great for is learning pacman. You can click boxes in a GUI, and then when you execute the various actions, a terminal opens and you can see the actual pacman commands in a terminal window. It helps out while you are learning pacman.
@Angelus, @ringo and I and several others have discussed some of these other options in previous threads. As an example, see Yay alternatives - pikaur and vpacman
Good luck, let us know how we can help.