I'm a huge EC fan & have most of his DVD/Blu Ray concerts. Any of his offerings after the mid 90s are recorded to the highest standard. Older concerts were a victim of the technology of the day & don't sound as good as the later stuff.
'Unplugged' is great if you like acoustic. I prefer electric blues & highly recommend the following:
Live in Hyde Park - Still one of my favs. Although a bit aged now, it was the concert that started a world tour that I saw in Vancouver (the final show of the tour). Great blues content & sound.
Live On Tour 2001 - One more Car One more Rider - done in LA.
EC & Steve Winwood - Live in Madison Square Garden. Eric plays 'Voodoo Chile' for the first time - wonderful.
EC - Planes, Trains & Eric - mid & far east tour 2014.
EC Slowhand at 70 - Live at the Royal Albert Hall - 1 Blu Ray plus 2 CDs boxed set. Excellent.
Eric has a bad back now & his touring days may be numbered.
I suggest Blu Ray if you can get it. I play all of these in surround on my HT system - wonderful to my ears.
Hope this helps...
TAM