Based on the past 10 days of Standard tournament data, Gruul Delirium appears to be the better performing deck. Gruul Delirium posted a 54.9% winrate (39-32) across 13 entries in 6 tournaments, while Mono Red Aggro had only a 48.4% winrate (121-129) across 59 entries in 22 tournaments. Gruul Delirium ranked 14th in meta presence at 1.44%, while Mono Red ranked 6th at 4.99%.
However, Mono Red has significantly more data behind it with nearly 5x the meta presence, making it the more established choice. Gruul Delirium's better winrate comes from a much smaller sample size. If you're looking for raw performance, Gruul Delirium has the edge in this window, but Mono Red's larger presence suggests it's more consistently played and could be more reliable in unknown metas.
The current Standard meta is dominated by Dimir Midrange (12.84% presence, 52.2% WR) and Simic Midrange (9.61%, 51.8%), with Izzet Looting at 8.3% showing strong 55.2% performance. Both Gruul Delirium and Mono Red appear positioned as tier 2 options.
Sources:
Data from 24 tournaments in the past 10 days: 54.2% MTGO, 45.8% Melee.
https://www.mtgo.com/decklist/standard-challenge-32-2025-11-2912825473
https://melee.gg/Decklist/View/3a635153-7168-4ca0-b044-b3a50009555a
https://melee.gg/Decklist/View/f23e7a38-6d76-41c9-8903-b3a500a332e8