Like others said that choice is not really given in this case.
Also with the government option it wouldn’t mean that you can’t still use other methods - for example in brasil credit card or cash work just fine, PIX is just one (very convenient) option.
Replying here to throwaway2037 because I can't reply directly to him, but yes, even most informal businesses accept PIX, including some random guy selling candy or bottled water at a stop signal.
The only exception I have found to consistently refuse PIX are some parking lots, and they refuse credit cards as well, accepting only cash, probably to hide their earnings.
Do corner stores (small informal convenience stores) in Brasil usually accept PIX? I assume they all cash-only.
Also: What is PIX uptake/penetration like in the countryside? China is shocking how fast that countryside wet/farmer's markets started accepting AliPay. Literally, you can buy a kilo of pumpkin (namguo) using nothing but your mobile phone with AliPay, and the old lady running the stand (in a wet market) probably has a 6th grade education. (No hate on that!)