The database has a single "Lotus Strings" archetype in Pioneer rather than separate WUG and UR variants. Let me check if there are distinct tracked archetypes for these color variants and look at the card data to understand what's being played.
The card data reveals two distinct builds within "Lotus Strings." Let me split them by their defining cards and compare performance.
Here is what the Pioneer tournament data shows over the last two months (April 8 - June 8, 2026):
The database tracks these as a single "Lotus Strings" archetype (color WUG), so the two builds are distinguished by their defining cards: the WUG version uses Emergent Ultimatum as its win condition, while the UR version runs Spirebluff Canal as a key mana piece (replacing the green splash for a blue-red shell).
On raw winrate, UR Lotus Strings is actually outperforming WUG right now: 54.9% vs 50.3% match win rate (excluding draws). However, WUG has significantly more entries (36 vs 14), meaning the UR sample is smaller and should be interpreted with more caution. WUG also has more absolute top 8 appearances (15 vs 7), though that follows from its higher play volume.
The short answer: UR has a higher winrate in recent data, but the sample size is limited enough that the gap (4.6 points) is not conclusive. WUG is the more popular and established version, and its top 8 volume reflects that. If you are looking purely at recent results, UR is performing better per entry, but we would want a larger UR sample before calling it definitively superior.
Sources: Data from 35 Pioneer tournaments (92% MTGO, 8% Melee). Recent events include:
https://www.mtgo.com/decklist/pioneer-challenge-32-2026-06-0712843814
https://www.mtgo.com/decklist/pioneer-challenge-32-2026-06-0612843805
https://www.mtgo.com/decklist/pioneer-challenge-32-2026-06-0512843782