Some home-brew is not quite a great way to capture since NTR capturing is buggy and doesn’t support DS /virtual console capture. Also, there is now a risk that Nintendo can ban your consoles if you use certain home-brew.
Since I got a Vita capture card from Katsukity and still works after hours of streaming Atelier Firis and some of Blue Reflection, I decided to buy a 3DS one since I have some money I can use. I decided to buy a used one from Japan, which cost about $309 in total using Amazon.co.jp and Tenso. It comes will all the accessories and the serial key to se the program. This significantly cost less than the ones sold new, which will cost $450. Loopy does not currently sell any and if there is any, it will cost over $600.
I plan to streaming Ultra Sun and Moon when it comes out in a few weeks. A full review on the card will come in December.