Knowing me, I have a few backup phones because I'm never satisfied with the battery life of just one phone and bringing along a powerbank is too bulky. Aside from the usual social media apps like Facebook, Twitter, and Snapchat, I usually have a whole selection of apps that I instantly install once I get another phone. They might not be for everyone but they're mostly free so you could easily try them out. I'll try to get to them as quick as possible.
Nova Launcher is a go-to launcher. I even bought the Prime version at full price just because I wanted to support the development team. However, I sometimes want something simple and quick. That's where I use Evie Launcher. It's a basic launcher that's quick and recommended for those who never used a custom launcher before. For wallpapers on said launchers, I mainly use Backdrops. Quite a lot of choices and they're all quirky and colorful.
For browsers, sure, Google Chrome is the most common but I despise not being able to block ads on sites that I visit. Opera and Brave Browser come in handy. Opera lets me sync open tabs and bookmarks from different devices as well as blocking majority of the ads.