I think it’s all comes to personal preference. Just for my personal experience I like my trident. I’m pretty we have members here that have a lot of positive experience with kH guardian pro. Good luck.
Since I’m an apex unit owner I bought the trident from aquatic collection yesterday while it was on sale. Also bought the 6 months reagent. My observation in general is that it’s a preference but I’m just a fan of apex so I’m biased