Starburst has multiple titles with 96-97% RTP which are decent because the max win is <500x and across thousands of spins wagering thats not so bad for volatility. I always jump to it if I get within 3-4x of my balance on a wager.
Any slot around that RTP and max win is a good pick for high volume wagering.
Sometimes if I have a few cents I will jump on low lines with a high linebet on something lthat can pay 1000x on a linewin. Hitting $80 on a 8c spin with 1 line is amusing when your down to under $1.
My favourites are none other than Heavenly Ruler, Thai Paradise (Playtech), Great Warrior, Roman Legion and La Dolce Vita (Gamomat), but these games cannot be played with bonus money now - WTF! 😝