SHORT ANSWER
The Ante Bet has no statistical edge in the traditional sense — RTP remains the same either way. The statistical gain is in bonus trigger frequency: approximately double the natural trigger rate at 25% extra cost per spin. Cost-per-trigger drops from roughly 250 to 156 at 1/spin. That is the only quantifiable advantage.

What "statistical edge" means in a fixed-RTP game

In card games, statistical edge means improving your expected return above the baseline. In a certified slot with fixed RTP, no player action achieves this. The Ante Bet does not improve your mathematical return per unit wagered — it maintains it at the base game RTP. What it does change is how that RTP is distributed across your session: more via bonus rounds (higher-value events) and less via base game spins (lower-value events).

This is a meaningful distinction. Getting more of your RTP return through bonus rounds rather than base game means larger individual wins even if the total return rate is the same. But it is not an "edge" in the gambling strategy sense — you are not getting more than the house allows.

The quantifiable Ante Bet advantage

METRICSTANDARD PLAYANTE BET (25% PREMIUM)
Stake per spin (base 1.00)1.001.25
RTP96.30%~96.30%
Approx bonus trigger rate1 per 250 spins1 per 125 spins
Cost per bonus trigger~250~156
Spins per 200 wagered200160

The cost-per-trigger advantage — 250 versus 156 — is the clearest quantifiable benefit. You are getting bonus triggers 37% cheaper per trigger. The trade-off is that each spin costs 25% more, reducing total spin count for a given bankroll.

Break-even analysis

The Ante Bet premium breaks even when the additional bonus triggers it generates produce enough extra value to cover the 25% per-spin cost increase. At a 96.30% RTP maintained across both modes, this should be approximately true by definition. But in a specific session, whether you come out ahead depends on how many additional bonuses you actually trigger and what those bonuses return.

If you play 200 standard spins and trigger one bonus, or play 160 Ante Bet spins and trigger two bonuses, the Ante Bet session had higher bonus exposure. But if your 160 Ante Bet spins produce only one bonus (despite doubled probability, it is still probabilistic), you paid the 25% premium without the frequency benefit manifesting. This is the risk of the Ante Bet in short sessions.

Minimum session length for Ante Bet to be meaningful: The doubled bonus trigger probability needs sufficient spin count to be statistically reliable. Below 100 Ante Bet spins, the actual trigger outcome is too noisy relative to the 25% cost to be confident the advantage manifests. At 200+ Ante Bet spins, the doubled frequency has reasonable probability of producing at least one more trigger than standard play would have.

BOTTOM LINE
The Ante Bet's quantifiable advantage is a 37% reduction in cost-per-bonus-trigger, achieved at a 25% per-spin cost increase. It is not an edge in the mathematical sense — RTP is maintained. It is a session structure choice: pay more per spin to reach bonus rounds more frequently. Statistically defensible for sessions of 150+ spins. Too noisy to evaluate meaningfully in shorter sessions.