Orion is available via ebay in UK shop, search for Vortex. Heard @ the world's on-road most user's swapped back to the LRP/Nosram esc.
Tekin has loads of adjustments but needs pc with software if you really want to fine tune it and can keep running it sensor lead drops out.
Nosram/LRP would seem best bets with life time warranty, if you keep the receipt
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