For GregTech, you take a stack of netherrack, stick it in a machine, wait a bit, pull it out, stick it in a workbench with flint, put it in another machine, then wait awhile.
The energy distribution is automatic. You dump a stack of coal (coke) in a generator. Boom. Done.
For EE3, you first need the minimum stone, which you have to craft, and it runs out. So you kill a bunch of mobs (in the current version). Not hard, but harder than throwing a stack of coal in a generator. Then, you stick cobble (which, if you're mining the normal way, is harder to get than netherrack, else it's the same) in a crafting table, make as much as you can, then go make another stone, which means farming more mobs. Meanwhile, the GregTech machine is still running, without you doing ANYTHING. Then, you have to manually craft all the various "tiers" of materials to work your way up to a single diamond. So let's count it in terms of interface interactions:
GregTech
1 (Dumping a stack of netherrack in the machine)
1 (Dumping coal in the generator)
1 (Grabbing stuff from the centrifuge. Can be automated, if you want)
1 (Crafting Table for coal ball)
1 (crafting Table for coal block)
1 (Compressor for block->diamond)
Total: 6, and a bit of waiting time, in which you can go do something productive.
Total Resources Used: 64 Netherrack, some coal.
EE3
1 (Minium Stone crafting)
16 (Cobble -> Wood. Assuming Shift+Click. 1024/1521 Transmutations used from the stone)
2 (Wood -> Obsidian, another 128 used from the stone. It's at 1152/1521)
1 (Obsidian-> Iron. 32 transmutations more. 1184/1521)
1 (Iron->Gold. 4 transmutes more. 1188/1521)
1( Gold -> Diamond 1 more transmute. 1189/1521)
Total: 22, and the need to go farm a bunch of mobs beforehand.
Total Resources Used: 8192 cobble (Same EMC as Netherrack, btw). Some sword durability (fighting mobs). 4 iron, 1 gold. Which, as you'll recall, is one fourth of the diamond to begin with.
Also correction to my previous post: The minium stone needs 8 shards of minium, 4 iron, 4 smooth stone, and 1 gold ingot for each one. So those are what you need to have before you start making diamonds.
So I say that GregTech is easier. On top of that, you can actually automate most of the process of GregTech's version, and you probably aren't even using just a regular generator for it, so you could possibly knock out the coal cost.
I see what you're saying. Honestly I'm glad you made this argument rather than just being a jerk about it like some people.
In counter to this, getting the stone is just about as hard as getting the machines. To get the machines you need to mine for a fair bit of resources essentially. To get the stone, you have to kill a bunch of mobs. Once you have the machine or you have the stone, things get easier. Once you have the machines, you can do stuff, but it'll take lots of energy and time. Once you have the stone though, you do things instantly. I don't consider interface clicks to be "difficult" on any level. And that process could be automated with pipes and Autocrafting Tables just as the GregTech process could be automated the same way.
Also, Cobblestone wouldn't be the block of choice for exchanging for Diamonds in this scenario. You choose whatever block is most efficient. In GregTech, Netherrack is most efficient, requiring 1,024 (16 stacks) of it, plus some Flint and an Obsidian for one Diamond. In EE, I forget how much Sand is needed, but it's a lot less than 8192 I'm pretty sure.
I'm fairly glad you made this argument though. I wasn't fully aware of this, so I feel a bit better about EE. Still I don't like the idea of turning ores into other ores though, it just feels cheaty.