This is incorrect. It charges about 6.5x faster on a 220 vs a 110 given the amp difference (50 vs 15)
Oops. Right, it depends entirely on what EVSE you have installed. It's
possible to install a super high amperage fast charger in the home, but that's neither necessary, easy, nor common. At a given amperage, apples to apples, a 240V EVSE will charge about twice as fast a 120V EVSE. But yeah, 240V EVSEs tend to draw more amps since they "know" they will be installed on a dedicated circuit anyway. That said, I doubt most people are going to want to go above 30A @ 240V for a home EVSE, since to do so many would have to upgrade their home's electrical service.
An electric clothes dryer draws about 6,000 watts, and this is generally the "size" of circuit that a homeowner can easily and cheaply add to their garage. Yes, rich and/or lucky people can and do go much higher than that. They just don't gain much actual utility for their money.
But yes, a typical 25A vanilla 240V home EVSE charges about 3 times faster, not 2 times faster, when compared to a plain ol' 1,800W outlet. My apologies. That fact doesn't really affect the point that I was trying to make: That both "speeds" are still similar enough that it doesn't
really change how one thinks about charging one's car:
Do I have plenty of juice for whatever driving I need to do tomorrow?
Yes: Okay, maybe I won't bother plugging in tonight.
No: Okay, I definitely gotta remember to plug in tonight.
No matter which kind of home EVSE you own, you're still probably gonna plug-in in the evening, and then likely not unplug until the following day. Because laziness. Tripling your charging speed will often just mean the charger shuts itself off at 10PM instead of 4AM. Sometimes that's important,(off peak rates!) but usually, it isn't.
I still recommend getting a
reasonably beefy EVSE, if you have the means. Not necessarily a 50A one however. Diminishing returns. It'll likely cost a bunch more to install, and
still won't be fast enough to do useful amounts of "oh-fuck-I-forgot-to-charge" charging.
TLDR: In the home, "fast" charging often isn't a heck of a lot more useful than "slow" charging. That's because both are still pretty darn slow, but still fast enough for most people. (People that drive 20-40 miles per day, and can charge overnight.)