OP, your post lacks even the most basic information to help you. To ascertain value, you have to be clear what you want from the car in terms of range, duration of ownership, and cost.
One simple example: if you have 50 mile drives and the range of the car is 40 miles then its value *to you* is about zero. Conversely, if you never drive more than 20 miles at a time then additional range has little value that depreciates quickly.
AFTER you think your situation through, I would say the 30 kWh LEAF's extra kWh and much better battery degradation warranty should be considered carefully. I doubt the resale market will give you back $2,000 more than the 2015 LEAF in a couple of years, but the higher priced car could be excellent value to *you* if it meets your needs and lasts for years longer than the alternative.
My gut feeling is that a LEAF in a hot climate without a warranty is a gamble I would not take if I had a choice. One thing you should do is verify the original sale date of the 30 kwh LEAF via a free VIN check on the web since that sets the warranty clock.
2013 LEAF 'S' Model with QC & rear-view camera
Bought Jan 2017 from N. California
Two years in Colorado, now in NM
03/18: 58 Ahr, 28k miles
11/18: 56.16 Ahr, 30k miles
09/20: 54.3 Ahr; 38k miles
2018 Tesla Model 3 LR, Delivered 6/2018