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SP's dealer network is a bit wider as many Aqualung dealers do not opt to carry Apeks, so getting service anywhere on the globe is probably easier with Scubapro.
As for DIY service, both companies control parts and limit access to dealers only - but Scubapro annual service kits show up all the time on e-bay while Apeks kits are comparatively rare, so again I'd go with the Mk 17 G250V.
That's true. But I have not found this for scubapro yet: Regulator Rebuild Kits