The official FB app is the single most bloated and resource heavy app on the entire Play Store. If you don't give a damn about that and really like the app, then sure, go ahead.
Both Simple and Swipe (the rival to Simple) are similar and present a very significantly less heavy alternative. They also support FB messaging so you don't need a separate app for that.
I'm not sure why Simple is slow for you. I use Simple Pro and it's about as fast as the official app. Takes like 2 to 3 seconds to refresh my feed.
The official Twitter app is sucks bad compared to Talon and Fenix. It's also hugely bloated, as a separate issue. Talon has a much more attractive design, can fetch your Tweets and mentions with much less resource use, has no ads and unwanted notifications, allows loads of customisation, has a totally uncluttered design etc etc.
If you care about Twitter they're incomparable. 100% of Tweeters I've told about Talon gushed about the upgrade. For an app you might use quite a bit every day, it's worth the upgrade.
On a side note, it's pretty weird that you're so opposed to supporting quality app development. I see free apps as dubious, not paid ones. The only free apps on my homescreen are Telegram, the phone function, BlueMail (which will become paid eventually), Apple Music (which isn't actually free), Chrome and the Play Store. Paid apps are usually the best apps.
Will have a look at those apps
