I think they're pretty comparable, but GG is essentially an uncuttable card for many Cubes with Aggro in my opinion since it is far and away the most fun Red one drop.
I don't know if I've told this story on this specific forum before!
Back in 2013?ish, I was at PAX East and Dave Humpherys was working the "play against a WotC employee, get a free booster" spellslinging table. I stood in line, sat down opposite him and pulled out
literally his World Championship 2003 semifinalist deck from my pocket. Pure chance, I was gonna meet some buddies and jam Worlds decks into each other cause it's way faster/more portable than Cube.
He loved it, we played a couple games because there wasn't any line after me. At one point I asked something like "can you tell me a cool story about being in R&D", he asked me to narrow down, and Goblin Guide is one of my favorite cards - it's still my Arena username - so I said, you got anything about
Goblin Guide, or Zendikar in general? And he says actually, Goblin Guide changed in testing.
When they first created it, it put the revealed land
directly into play.
Turns out that in any normal Limited game of Zendikar you had a ~40% chance to trigger all your opponent's landfall creatures and get your entire board eaten alive by suddenly enormous blockers.
Oops.
You think it's fun
now, imagine how much adrenaline that unplayable version would have produced when you attacked!