It was a crazy Tuesday night. The kids were crying and hungry. I had cold chicken in the fridge and no time to bake. That is why I rely on fast air fryers to save the day. If you want a quick meal, you might wonder about the Ninja AF400 Vs SL400. I have tested both units in my own busy kitchen to see which one cooks better.
Ninja AF400 Review
The Ninja AF400 is a very big air fryer. It has two zones placed side by side. This big unit holds a lot of food for a huge group. It cooks fast and makes dinner so simple.
Pros and Cons
Here is a quick look at the good and bad points of this model.
| Pros | Cons |
| Huge cooking space | Takes up a lot of room |
| Very fast cooking speed | Heavy to move around |
| Drawers are easy to pull | Drawers can feel bulky |
My Daily Life With The AF400
After using it for a couple of months, I really love how fast it cooks. I can roast a whole chicken on one side. At the same time, I can fry potato chips on the other side. The food always comes out hot and crispy.
It makes dinner so simple. The fan runs a bit loud, but the smell of hot, salty chips makes up for it. I use the sync feature every day to make both sides finish at the exact same time.
Recommendation
This machine is perfect for a big family with a wide counter. It is not good if you have a tiny kitchen or small counter space.
Ninja SL400 Review
The Ninja SL400 is a tall vertical air fryer. It stacks the two big drawers on top of each other. This saves a ton of space on the kitchen counter. It still holds the same huge amount of food. The slim shape is great for a tight cooking space.
Pros and Cons
These are the main pros and cons I found while testing this tall unit.
| Pros | Cons |
| Saves counter space | Very tall shape |
| Cooks four layers at once | Top drawer is a bit high |
| Fast and crisp results | Reaching the back is hard |
Cooking With The Vertical SL400
I got this unit a few months ago when my kitchen felt too full. The slim shape was a huge relief for my tight space. I love that it comes with wire racks. I can put meat on the bottom and veggies on top inside one single drawer.
The heat moves very well and gives food a great golden crunch. I have to reach up high to check the top basket. But the smell of sweet roasted carrots makes it totally worth the reach.
Recommendation
This is perfect for folks with a small counter who still need to feed a crowd. It is not good if your top cabinets hang very low.
Detail Comparison for Ninja AF400 Vs SL400
Both of these air fryers are huge and fast. They share many parts, but they fit in your kitchen in very different ways. Let us look closely at how they match up.
Capacity & Size: Ninja AF400 Vs SL400
Both units hold a massive 9.5 liters of food. The AF400 is wide and takes up side room. The SL400 is slim but sits very tall on the bench.
| Feature | Ninja AF400 | Ninja SL400 |
| Total Space | 9.5 Liters | 9.5 Liters |
| Shape | Wide and flat | Slim and tall |
Rating: Ninja AF400 8/10 | Ninja SL400 9/10
Cooking Performance: Ninja AF400 Vs SL400
Both machines use the exact same strong heat. They both make food very crisp and nice. The SL400 lets you use racks to cook four layers of food at once.
| Feature | Ninja AF400 | Ninja SL400 |
| Heat Power | Very strong | Very strong |
| Layers | Two layers | Four layers |
Rating: Ninja AF400 9/10 | Ninja SL400 9/10
Ease of Use: Ninja AF400 Vs SL400
The wide AF400 has buttons right on the front. They are super easy to see and press. The SL400 has buttons on the side, which feels a bit odd at first.
| Feature | Ninja AF400 | Ninja SL400 |
| Button Spot | Front face | Side face |
| Drawer Pull | Very easy | Top is a bit high |
Rating: Ninja AF400 9/10 | Ninja SL400 8/10
Cleaning & Maintenance: Ninja AF400 Vs SL400
Washing these machines is quite easy. Both have safe parts that can go in the dish washer. I mostly just wipe the slick pans with warm soap and water.
| Feature | Ninja AF400 | Ninja SL400 |
| Pan Type | Non-stick | Non-stick |
| Washing | Very easy | Very easy plus wire racks |
Rating: Ninja AF400 9/10 | Ninja SL400 8/10
Build Quality & Design: Ninja AF400 Vs SL400
Ninja builds very tough products. The AF400 feels like a solid block on your counter. The SL400 looks very cool and sleek, but the tall shape might sway a bit if bumped hard.
| Feature | Ninja AF400 | Ninja SL400 |
| Shell | Tough plastic | Tough plastic |
| Stance | Firm and wide | Tall and slim |
Rating: Ninja AF400 9/10 | Ninja SL400 9/10
Conclusion
Picking a winner is tough. The AF400 is a classic wide unit that cooks fast. The SL400 saves so much space and still feeds a crowd. If you lack space, go tall. If you have room, go wide! Both will make your life much easier.