Yes the Meynaf viewer "should" be the best. I was in horrible pain when it came out so never tried it ... then forgot about it. Ooops 
Then go and try it NOW

Meynaf knows how to code so it should be awesome for AGA.
Would be interesting to see timing test race of Meynaf vs. FastJpeg_AGA
Yeah, it's great for AGA. Renders faster and better than FastJpeg AGA as far as I know. JPEG is never going to be fast, but the HAM8 rendering is very good (and fast), and the fact that all the common formats are supported makes it even better. It's command line only, though.