Difference between Mira +HEN and VTX HEN?

Hi I'm just wondering what the difference between the two are? Using the Mira HEN I had issues with sleep mode like most. Using Vortex HEN it seems sleep mode works fine!

Whats the difference between the two and is there any reason to use one over the other from an end user non dev perspective?

I've not seen much talk about further development I keep up to date on here, psx place and Wololo. Plus I'm following Spectre on Twitter.

Thanks!

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