If quality of competition truly mattered, then IE wouldn't have had to be stopped with legislation
Yes it was. You're ignoring all the other things proprietary about IE and only considering the OS bundle one. JScript, VBScript, and ActiveX were the real problem. There we so many proprietary extensions to IE that were not even remotely supported elsewhere. Hell, C# even came out of the hell that was Microsoft's JVM, J++, and J# thanks to those trials
On desktop I personally use Firefox because I find it to be a good blend of performance and resource efficiency, plus it has excellent support of content blocking add-ons.
[To clarify, I had intended to refer to Safari on iOS specifically, vis a vis complaints about the lack of engine choice on iOS. But I recognise that my post didn't say what I had intended.]