I drive less than 6K miles per year... Some days each week, zero miles... and I have a brand new S90D I took delivery of last month. Previous posters cover most of the considerations... The list could go on-and-on, but off the top of my head, here's mine:
Size -- if you need it to haul people or just a bunch of stuff, MS can do it, unlike the other big name EVs. MS is physically massive, so that can also be a disadvantage if you prefer to drive a compact.
Amenities -- if you are used to, or just want luxury appointments and options like what you may be used to with Lexus or MBZ, Tesla competes well; Other EVs are much more comparative with mass-marketed $20K+ ICE vehicles, not $50K+ luxury brands that MS plays with
Cost, Range, & Battery Life -- There are many other threads on this, with as many opinions. For perspective, I drove 2 different Lexus RX Hybrids for 10 years (since 12/2005 when they became available in the US) before purchasing my MS:
- With my relatively low annual mileage, I couldn't justify the additional cost of owning a hybrid with what I saved in gas; The same may be said with some EVs and their initial cost, even if charging them with electricity may not seem like it costs a lot in comparison (gas is still over $3.50 for premium at many places where I live in So Cal). If you are on-the-road and need a charge, remember Tesla Superchargers are free for life -- unlike all competition today. Just as with my former hybrids, there is no way I can personally cost justify my MS based on the miles I drive each year.
- Short commutes with any ICE or most any EV will likely not be a problem ...but do you occasionally take longer trips where some of the other EVs may take multiple charges to reach your destination, and depending on the model, may take a very long time to charge at each stop? MS has a huge leg up on range compared to competitive EVs -- other brands and the press speculate what others may have in future years, but Tesla is there today. While CHAdeMO is fast for EVs that use that charging interface (MS optionally can) -- not all do. Tesla can be really fast to charge, e.g. about 170mi in 30 mins at a Supercharger when you're on the road, or I can completely charge my 90D (~255 mi rated range) in about 5 hours at home with it's optional dual chargers and my 80-amp circuit. Again, I have very low average daily mileage -- but I do take occassional trips of 150+ miles where I want to go 70MPH most of it and not have to stop anywhere for refueling or recharging, and I do sometimes take road trips where I want to do 300-400 miles/day. I chose not to maintain a 2nd (ICE) vehicle for those relatively few road trips. I also don't want a huge hassle with excessive time to charge along the way that I'm not used to -- hence why I spent the extra money (that is nearly impossible to cost justify) on my 90D vs the smaller battery in a 70 or 85... Fortunately, Tesla provides options depending on your needs and desire.
- Before you buy another EV, be sure you investigate how satisfied people are with battery life, it's warranty, and expected lifespan, especially if you live or frequent more extreme temps for extended durations. I won't go into that any more here -- you can research and draw your own conclusion, but IMHO, nothing beats Tesla tech TODAY when it comes to it's battery life and 8-year warranty (that covers practically any failure beyond you physically damaging it in a wreck or taking a screwdriver or sledge hammer to it).
Fun -- If you're into performance and have the dollars, no other EV has ludicrous mode. I like fun, but have no need to practically go supersonic as some do, and honestly, pressing my foot down on a long on-ramp going 0-60 in 4.2secs is pretty dang awesome in my 90D. IMHO, other EVs don't compete with the fun factor any of Tesla's models offer.
Good luck with your test drive, and good luck with your decision.
The list goes on and on....
