My opinion is that Triton has system requirements/recommendations on physical setup turn over ratio, % dedicated to algae sump, etc . Which can be used with RM or not.
Triton has Core7 plus other methods for major 3 plus it includes trace elements. RM recommends major 3 void of other elements and you adjust based on ICP tests.
RM has higher target levels. Considers rubidium and fluorine important. Seems to put more emphasis on Barium and iodine especially Around SPS and TN issues.
open on ratios Recommends what is thought to be most consistent manufacturing of elements example vanadium is Tritons, iodine Seachem.
Recommendations in calculator allows for any ICP testing. But 2 (ATI and Triton) come more highly recommended. With ATI topping based on Flourine and RoDi testing in each kit
very good support through facebook
Risk factors; he’s a one family show with a cult following. Shipping of elements outside the us