Atmos Financial might be a bit more popular than Brex. We know about 1 link to it since March 2021 and only 1 link to Brex. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Nerdwallet has a pretty good comparison chart for secured business credit cards. You'll find many of them with cash back rewards, but I haven't seen any with flight rewards though. You can also build business credit with regular credit-that-works-like-debit cards from Brex, Dappr, and several others. Source: about 1 year ago
I can't say anything for the others, but I've been using Atmos for about a month and a half now. Everything works great and I highly recommend them. Source: almost 2 years ago
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