I like the blend of both, bit more aggressive sounding.. i can hear the marshall add a bit of grith and grind to certain part of the lower register chords and i like that, the randall alone sounds better than the marshall alone obviously. Its a extremely small SS amp and was probably not super cranked either and no matter how its miced it'll always sound thin unless you use some really super sensitive condenser mics or something.. I tried doing this bunch of times with a small SS amp i had similar to yours. However, eventho it sounds good as is, the randall alone lacks that extra grit/grind of the marshall and both together seem to growl a bit more especially on the low chords which i like.