As someone who started with a Vortex, then got Assioma Duo to use with Powermatch and now has a Kickr Core. The Vortex is a great trainer for the money but i would not say it is accurate unless you keep the tyre pressure consistent and calibrate it after it is warmed up. I was in the same predicament to you and ended up buying Assioma Duo when they were first released. For me having reliable and consistent power readings both inside and outside was more important to me than a better trainer. I would be surprised if you FTP is the same if you do decide to buy the Assioma as my Vortex was reading around 30 watts higher than the pedals. I used the Vortex and Assioma together for around three years but then decided to upgrade the trainer last year and went for a kickr core.
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