Tesla supplied charger to socket
Tesla supplied charger to 16A commando
Tesla supplied charger to 32A commando
Dedicated 7kw wall charger
1st 3 are going to need the UMC ... so if you might need it on a journey you'll have to disconnect it and take it with you (which will at times be wet / miserable if your Commando socket is outdoors). Creates wear-and-tare on the UMC too of course. If your wall charger breaks you still have the UMC. If all you have is the UMC then there is no backup
I used to say "You might need the UMC in the car for an emergency" but I can't remember having an unplanned need for UMC in around 200K miles of EV driving.
But ... my UMC is in the car, and I'm not going to forget to take it on a trip to friend/relies for the weekend - most people don't have a memory like a colander like mine though
The requirements for 32AMP / 7kW Commando (for charging an EV ... and that includes a socket in the garage where the cable could reasonably be expected to reach outside) make the cost much the same as a wall charger
Definitely true though that a low mileage driver doesn't need 7KW. If you come home "empty" then provided you aren't going anywhere long distance the very next day then you can just take 2+ nights Off peak to refill the battery. From 0% to 100% @ 7kW is 10-hours, ish, so even a 7kW wall charger can need a couple of nights to replenish when you come home empty. Its a bit
squeaky-bum to arrive home at 0%
so that will be rare, and recommended daily charge is 80%...90%, so 4 hours off peak is going to add 40% (110-120 miles) to a Long Range. If you routinely do 200 miles in a day, particularly if back-to-back, then consider a longer overnight tariff - something more like the old Ecconomy-7 tariff.
If you routinely do 100 miles back-to-back then you'd be better off with 7kW charging.
Wall charger is most convenient IMO. Yup, its £1,000-ish ... but if you are going to be in the house for a while (or you think it adds some saleability to the property) everyone with a drive is going to want at least one wall charger before very long. Your car, other household members ... visitors!!
Are you likely to have a second EV on your driveway in the future? You could put in the extra cable for that at the same time maybe.
Tesla wall charger has a button to release the wand, I find that convenient (otherwise need to open the APP, or reach in and fiddle on the dash, or similar ... or a Siri command if that's your thing) (Model-S has a button inside the charger-flap to release the Wand. No idea why M3/MY haven't got that ... sorry!)
I also have a Zappi, which will indeed "spill" excess PV to the car, but having installed it I don't use it in that way. I have, instead, set up Home Automation to control charging the car when there is excess PV, and thus "any old dumb charger" will do.
With benefit of hindsight I personally think that a dumb charger is best. Its always on (as soon as you plug in) so I can then just tell the car to charge when I want it to (e..g from my APP an hour before we leave - and put the climate on (using Mains rather than Battery(**)). I have a schedule set up for overnight off peak. Sometimes I come home and want to charge "now" (e.g. going out again (rare) or (more likely) coming home very low and don't want to leave the battery that low until "Overnight" schedule). With the car set for an overnight scheduled charging period it won't start charging when you come home and plug in (it remembers the schedule for that location), you do have to override (dashboard or APP) for that, so "Come home, plug in" will mean that by default it will for the overnight scheduled time to start.
A mate visiting can just plug in and start charging - whereas a smart charger (ie.. scheduled to only providing power during Off Peak) needs fiddling with the APP whenever you want to override it.
(**) if you overnight rate is dirt cheap, and you are not going far, it would be cheaper to use the Battery rather than peak-rate mains ...