The issue of "which brand sealanat" Alpha Systems (roof membrane manufacturer) or DICOR (industry standard) to use is much the same as "arguing" that MOPAR, DELCO and Motor Craft products are "better than" aftermarket or competitive products. I don't think any of us would "argue" that Mobil 1 or Rotella oil are "not as good as" or "better than" the OEM brands...
It's much the same with sealants for the roof membrane. Here is the link to download the DICOR instruction booklet: https://dicorproducts.com/rudys-down...care-handbook/
In this booklet is a complete guide to how to care for your roof membrane. Alpha Systems manufacturers the actual membrane, but DICOR is the "industry leader" and has far more information available for the consumer. The DICOR guide download button is on the right side of the link page.
Essentially, the "concerns with sealant" has to do with the amount of solvent that is in the sealant and how rapidly it dissipates. The solvent is necessary to cause the sealant to adhere to the membrane. Take it out and the sealant won't work. Put more in and it will "dissolve" the TPO membrane. That is the essential reason why the "old style DICOR sealant" is no longer used for TPO products. It won't damage the membrane's ability to prevent water intrusion but it will make it appear "buckled or melted". So, Alpha Systems and DICOR formulated a new sealant line for TPO use. It has a different type of solvent that "outgasses faster" so it isn't in contact with the membrane for as long and doesn't "make it soft" for as long. That protects the membrane from "melting" when the sealant is applied.
Either product, DICOR or Alpha Systems will work equally well as long as you buy the correct part number sealant. The numbers are in the booklet that you can download from the above link.
ADDED: Here is the link to the DICOR sealant information: https://dicorproducts.com/product/epdm-lap-sealants/
You'll want to use "self-leveling 505 series sealant on the horizontal surfaces and "non-self-leveling" series 551 on the vertical surfaces. They are available in the "standard roof colors" and in "ultra white".