AJ 1 and AJ 1.5, which pair is more cost-effective and more durable? What is the difference? Which pair do you recommend?

The cost performance ratio is of course .5, and it is more durable. It's only .5, and its appearance is heavier than that of 1. If your budget is good, North Carolina 1 Fengshui 1 is fine. It depends on your personal preference. After all, it is more expensive to blow up to 3000+ black and red lightning.