Klaus
First Post
In each case I've only included the minimum required to play the game. Otherwise, you inevitably get bogged down in comparisons over what is "like for like" - the 1st Ed PHB, for example, has fewer classes than the 3e version, is black and white vs full colour, etc. (Conversely, the 1st Ed DMG is more essential for play than the equivalent volume in any edition since.)
In the case of the MC volumes, MC1 was comparable to the 1st Ed MM in terms of page count, although having one monster per page probably meant fewer monsters in total. But adding MC2 means it very definitely has more than the 1st Ed equivalent.
So, it's a tricky one. I don't think any perfect like-for-like comparison can ever really be made.
I'd go with the "three initial books" for each edition, in whatever form they'd take. For 2e, that'd be PHB, DMG and MC 1 + 2. For Essentials, It'd be the HoFR, HoFK, DMK and MV.