I don't think the mode e.g. triode vs pentode etc. really alters your decision to use am MC or an MM cartridge. The preamp as you noted does matter.
What it really boils down to is, which sound, between these two, you will prefer. I own a Dynevector 20X H.O. and think it is fantastic but the analog gurus are not enthusiastic about high output MC carts. I also have several MM carts on different tables, but not your Ortofon choice. I can tell you the ability to really dig out the details and the huge dynamics that the Dynevector has aren't matched by the MMs (Goldring) Grado ?-Moving Iron).
My advice is to go with the Dynevector even the HO version, that's my choice. Your choice should be made by audition in the best case scenario.
What it really boils down to is, which sound, between these two, you will prefer. I own a Dynevector 20X H.O. and think it is fantastic but the analog gurus are not enthusiastic about high output MC carts. I also have several MM carts on different tables, but not your Ortofon choice. I can tell you the ability to really dig out the details and the huge dynamics that the Dynevector has aren't matched by the MMs (Goldring) Grado ?-Moving Iron).
My advice is to go with the Dynevector even the HO version, that's my choice. Your choice should be made by audition in the best case scenario.