I made the same purchase decision about 6 weeks ago and bought a 2019 SL Leaf Plus, that went into service in 2020 with an soh of 91.5%. The decision was a combination of features, value and lower total cost of ownership.
In the US we have a $4,000 tax credit for used EV or phev, The qualifiers are the car has to be over 2 years old, and sold for under $25,000 by a dealer.
I was more interested in advanced safety features than a battery-powered vehicle, but the federal tax credit tilted my decision towards an EV. Of the 30 or so cars that qualify for the tax credit. My list was narrowed down to an SL Plus Leaf, the highest trim level Kona or Nero, or an older higher mileage model 3.
No one can reasonably argue that the model 3 or Hyundai Kia aren't more advanced vehicles, but they also come at a price premium of $2K to $5K over the Leaf Plus. To get a Tesla 3 under $25,000, You're looking at an older higher mileage vehicle which brings more reliability concerns and the earlier cars have well-documented build quality issues.
The Kia Niro and Hyundai Kona have an excellent features. But my personal experience with the Korean cars and that of friends and family at least in north Texas has been problematic, very poor dealer experiences and parts of availability that took 6 to 12 months to resolve. I am less comfortable with these makes for service and reliability reasons.
The model 3 is an excellent car, I have several friends with them. The earlier ones are louder than the Nissan and have a rougher ride. Interior components such as the seats haven't held up as well. Repair costs can be high. And my insurance premium on a model 3 was $110 a month higher than an SL Leaf Plus
The Leaf Plus won based on a purchase price of $18.5k versus $22K to $25k, good build quality, comfortable ride, a decent dealer Network, The pro pilot cruise control and other driver safety tech, Android auto, And I prefer the interior of the SL plus over the other cars.
The only downside I see with the leaf is the lack of thermal battery management and obsolete ChadeMo QC charging. I drive about 7,000bmi a year and I'm able to charge it home. Road trips are once or twice a year, so the chadmo limitation isn't an issue for 98% of my driving.
I'm very happy with this purchase, happier than I expected to be.