In 2013 and later, the Leaf has 3 trims (S, SV, and SL). The SL is the highest trim level and the S is the lowest. Higher trim levels have features such as more efficient heating, a quick charging port, heated seats, a bigger screen, all around cameras, etc.
2016 is a special year. S trims had the 24 kWh battery, while SV/SL trims had the 30 kWh battery. The 24 kWh battery is generally more reliable in that model year, but the 30 kWh is more desirable because it gains an additional 20% range. Personally, I'd prefer the 30 kWh. If you do get a 30 kWh battery, ensure that the battery firmware update (recall) has been installed.
The cheaper of the two doesn't say what trim level it is, but it does have pictures. It has 12 capacity bars and estimates 85 miles at 100% charge, which for a 12 bar car means it's a 24 kWh battery. This means that it's an S trim.
The other one is a 30 kWh battery, but it doesn't have any pictures. When you're buying a leaf, you need to know the battery capacity FIRST before you make any buying decisions. Battery replacement is ~$9k for a 24 kWh Leaf and $12k for a 30 kWh Leaf. You really don't want to replace that--you want to buy a car with a good working battery so you won't have to. There's a great guide on this here:
https://www.mynissanleaf.com/viewtopic.php?t=26662
Here's a great picture to show you where the capacity bars are located. A lot of people confuse the large charge bars for the capacity bars. What is important is the small capacity bars, as they indicate the battery health. At that price, you should be looking for a car with all 12 bars.
https://survey.pluginamerica.org/leaf/soc-display.jpg
Personally, I don't think either Leaf is a good deal. 10k for a 24 kWh Leaf seems a bit high (although I've seen others pay it), and 16k for a Leaf seems extremely high, 30 kWh or not. I've said many times that if I was looking to buy a Leaf, I'd buy the one that cwerdna is selling on this forum. Just look up the name cwerdna. I think he's asking $6500 for a 2013 11-bar Leaf out of California. Even with $1k in shipping, that's $7500 for a Leaf.
The first question is: What are your range needs? Do you have charging at your destination, or will you only be charging at home? Is that side roads or highways? You shouldn't buy any car that doesn't meet your range needs, at any price.