When I shopped for my first electric, the Spark EV, the Fiat 500e, the Smart Electric, and the Imiev were on my short list. That was in early 2017, so most Spark EVs were the 2014s coming off lease ($7k), and most of those, if not all, did not have the DC fast charging. The Fiat 500e were off lease ($7k), and nobody seemed to want them., the Smart Electrics were the same way ($5k), and oddly, everybody wanted nearly an arm and a leg for an Imiev ($8k).
I test drove an Imiev I found for cheap and it was fun. I liked that car. I got the dealer down to $5500, an SE with the alloy wheels, Nav, and backup camera. Was about to bite, when I saw a Fiat 500e for $6500. After that test drive I was sold. I did not regret at any time in the ownership of that vehicle. If Fiat can loose $14000 on selling the 500e at the $36000 MSRP, who am I to argue with a $50000 car for $6500? Seriously, the car has high-quality Bosch made parts.
Anyway, though I thoroughly enjoyed the Fiat, I was still curious about the Spark. I did a lot of research and it seems that the Spark EV is the most efficient EV out there, averaging about 5mi/kw combined. My Fiat got 4.1mi/kw, and currently my FFE gets about 4mi/kw.
Tony Williams of Quick Charge Power got 95 miles range driving 62 mph on San Diego freeways.
Sparks are currently selling for about $8000 average, and finding a dealer who even understand DC Fast Charging is a miracle. You can provide the CSR representative at the Chevy.com chat tool with the VIN, and ask if the vehicle has "provisions for fast charging". If the one you are looking at does not have it, they can probably find you one.
When I bought my Fiat, the cost of the FFE was out of my budget, just like a RAV 4 EV, or a Mercedes Benz B250e. But because I saved so much money, not buying gas , in 2019 I started shopping again for a different EV. I was happy for tooling around town with the Fiat, but I wanted to be able to go further. The 2017 FFE with the larger battery and DC Fast Charging was now on my radar. After taking a test drive, I felt this is what an electric car should drive like. It reminded me a lot of my Jag. It did not have the acceleration of the Fiat, but it was more comfortable to drive. The Fiat was fun, the FFE is enjoyable.
For comparison, I drove a 2016 Spark EV with less than 8000 miles on the odometer. My god it was tight. Sportier than the Fiat. But because the Spark was still limited to 95 miles, and I knew folks were getting high 120's with the FFE, I paid more and got the FFE.
Lets say you gave me $8000 to buy either a Spark EV or a Fiat 500e, same year, same miles. With the Spark I would hope for DC Fast Charging, and caring ownership. With the Fiat, I would get change, and faster level 2 charging.
But your dilemma is between a FFE and the Spark. I don't believe you could get a 2017 or 2018 FFE for $8000. You could probably get a 2015. But that will have less range than the Spark. It will be a more luxurious vehicle, it will not stand out, but people will look twice when they do not hear it. It will charge twice as fast, and will not feel cramped. However, if you like hot-hatches, the Spark is one. As for reliability, the Spark has less on it to go wrong. And you can read through here about the problems that people have had with the FFE.
If it was me in my present situation, I would get the Spark, because of my curiosity, and the fact that I already own an FFE.
I have probably said enough. Is anyone still awake?