Performance enhancement from 33 cents per workout

For several months now, I've been alternating two workout stimulants that I like, Yohimbine HCL® and HMB.
Both enhance my workouts qualitatively and quantitatively. I'm able to move more weight for more reps on these stimulants. Subjectively, the big difference between the two is that Yohimbine works by releasing adrenaline, the fight or flight stress hormone. So it makes you feel a little more on edge and energized. I generally manage stress and anxiety well, so I haven't experienced any negatives from using Yohimbine, although I would want to be doing something visceral while on Yohimbine. I wouldn't want to be just sitting in my home office while on Yohimbine. HMB, on the other hand, does not make me feel energized as a classic Nootropic would, but there is a clear uptick in my gym performance.
It is hard to objectively say which enhances my workouts better. I would say that they both enhance my performance by 10% - 20%. I’m perhaps limited in evaluating these because I’m not a hardcore athlete; I go to the gym several times a week for 90-minute sessions to stay fit and healthy. I’m rather conservative at the gym; making gains and putting on muscle are secondary goals for me. I’d rather have slow, consistent growth in my lifts and weight than really push myself and risk injury.
I did experiment with combining the two.
One Sunday afternoon, I did a 90-minute workout on 1000 milligrams of HMB and 5 milligrams of Yohimbine, which was (unsurprisingly) very stimulating and resulted in a great workout. I made gains in my lifts and did 25 pull-ups. I usually do about 20 minutes of cardio at the gym while brain training with Dual N-Back Pro, which is usually a bit challenging because my gym often blasts awful Hip Hop music, which is, to say the least, a non-optimal audio background for brain training. My brain training scores while doing cardio are usually lower than when I do it sitting at home. I do think that Yohimbine, at least, is a bit of a cognitive enhancer because I had a nice uptick in my brain training scores on this stack despite the distracting music.
Cost and Dosage Comparison
Fifty 5-milligram Yohimbine tabs are 21 euros ($22). I've been doing 15 milligrams per workout session, which comes to $1.30 per workout. I found that 1000 milligrams of HMB has a similar effect; a bottle of 120 x 500 mg capsules costs $19.95, which is just 0.33 cents per workout. Both are pretty affordable, but HMB is a better deal!
Once I exhaust my supply of Yohimbine, I'm not sure if I'll be reordering it. I'd rather use HMB going forward and will continue using Creatine.
HMB Review: A notable uptick in gym performance
I’ve taken 1000 milligrams (two capsules) of HMB before workouts, and I believe there is a notable uptick in my gym performance. I’m able to lift more, along with doing more pull-ups and push-ups. I’ve been getting acquainted with some pre-workout supplements in the last few weeks. I’ve also tried Mildronate before workouts. It’s hard for me to…