There are alot of good mixes available and you can succeed with many of them. My advice would be to write down your desired parameters and then look at the parameters the mixes you are considering yield and choose the one that yields the closest parameters to those you are wanting. If there are several good quality mixes that yield your desired parameters I would look at the reviews for each and choose the one that most consistently gets good reviews. Alk will be the biggest one you want to look at imo as calcium and magnesium are more universally accepted optimal levels where alk levels people want are all over the place. I personally am running all at 8.5 and the mix that yields that for me and also has great reviews and is brs recommended is HW reefer mix and that's what I have been using for a few years with great results. It's very consistent and leaves very little residue and mixes much quicker than most other brands I've used. I have been mixing saltwater for 40 years and have used alot of brands over the years. I try to stick with the same brand as long as possible pretty much until it is no longer available or gives me issues. I have used for 1-5 years the following brands and where some were better than others none were bad: instant ocean and reef crystals, coralife/energy savers, original red sea(their first mix), red sea pro, tropic Marin original and newer tropic Marin pro reef and tropic Marin bioactif, Kent, fritz, aquaforest, hw, and probably some I dont remember. In the end alot is personal preference but I believe my preference for hw is based mostly on real results. I definitely dont profess to be an expert or that my opinion is any better than anyone else's tho.