I’ve got the 990v5, 990v6 and 993. The v5 hugs my foot the best, and isn’t squishy, but very comfy and supportive for walking all day. It’s definitely the most dad-looking of the 3. The v6 is much softer underfoot, so very comfy but maybe not ideal for standing all day, and looks much sportier, almost Hoka-like.
I haven’t worn the 993s out yet, but they feel similar to the v5. They’re often regarded as the GOAT by NB enthusiasts for their comfortable support and versatile looks. It’s all personal preference, maybe check out the NB reddit for info/ideas.
Sizing is also a hot topic with miUSA models. If you like a snugger fit with your toes almost touching, go 0.5 down, if you like more room, TTS is a safe bet.