Personally, I don't assume they're implemented differently - I use neither because I don't trust closed source code, I don't trust big tech corporations like FB

Personally, I don't assume they're implemented differently - I use neither because I don't trust closed source code, I don't trust big tech corporations like FB, and I definitely do not trust closed source code from big tech corporations like FB. Mind you, I say this as someone who audits closed source code at a big tech corporation as a profession - someone who deliberately avoids using a single piece of closed source software developed by their employer on any personal devices despite it being ubiquitous and in widespread use.