I've used a lot of kits over the years....so far not Tropic Marin or Elos.
FWIW, here's my $0.02
Minerals
Alkalinity, Mg and Ca it's going to be hard to beat the Salifert kits. They are reasonably priced, very consistent and very well known, so you can have a small chance at having comparable results with someone else. They are also very user-friendly simple and fast to operate. Alk is by far the most important to have. Depending on the tank you may do very well with only this kit.
Nutrients
PO4 I would go for one of the Hanna kits. Personally I like the Phosphorus ULR kit which measures Phosphates (PO4) from 0.0 to about 0.6. You won't go wrong with their Phosphate ULR kit either though...measures from 2.5 down to 0.0...just that if PO4 ever gets that high, A) algae will tell me and B) I have about the same strategy for 0.6 as I do anything higher than that.
Nitrates are almost always a colorimetric (color comparison) test and I pretty much dislike them all equally. This is also one of my least-worried about factors...YMMV, but you may find you can do without this one. Certainly I wouldn't spend money on Ammonia or Nitrite. You're doing something wrong (probably rushing something) if these seem important. Your LFS probably offers testing for these parameters and to the extent one should need these tested (barely and rarely), that should suffice.
pH
pH...ditto my feelings on Nitrate kits. Thankfully economical pH pens and other electrical options abound, including those from Hanna. Again depending on the tank, most people are better off focusing on Alk and not worrying about pH anyway. It's a cheap and easy test (even the electric ones) so lots of people do it...it's not that straight forward to interpret though so aquarist's reactions to pH often cause further problems. (This is unlike almost every other param we're interested in where you're measuring something straightforward like a concentration of something.) I very rarely ever recommend someone to test their pH.
Trace Elements
I would never recommend that someone test for Iodine....ever. If you are still crazy (and I mean goofy-crazy!

) enough to do it....use the Seachem Iodine test...it comes with a good reference solution and it's the best compromise of simplicity and good consistent results IMO. But don't get me wrong, those are relative observations....the Iodine test is neither simple, nor consistent in it's results. I will repeat, I do not recommend testing for I. Use
aquariumwatertesting.com's service
* if you're really that into the minutia like this....they are properly equipped to get (more) meaningful and consistent numbers.
Summary
Honestly, my advice would be to get a Salifert Ca and Alk kit (or pick your own favorite brand) and if you're really hardcore about over stocking and heavy feeding, then a Hanna PO4 meter as well. Beyond that, I would send out for testing the other params you'd like to know about. (BTW, If you felt at all happy with the old Red Sea test kits you will likely be blown away by any of the brands you mentioned as well as the Red Sea Pro's and Salifert kits. Those old ones were among the worst kits on the market IMO....Red Sea did right by discontinuing them.)
* I'm sure it's only a coincidence, but these guys are located literally around the block from Hach Chemical.