Question Which abdominal vacuum variations are more effective?

[Pearex]

For some time now, I've incorporated abd vacuum exercises into my routine to slim my waist, improve core control, and achieve a more aesthetically pleasing physique. I've tried almost all variations regularly (supine, on all fours, standing upright, and the classic Arnold variation with forward lean for support). However, I'm seriously confused about which position gives me the best results

Having tried almost all variations, which anatomical variation do you think is the most effective in achieving the highest level of hypertrophy/activation in the TVA muscle?

 

[brd]

I dont think its gonna make a difference, chose an ab exercise which is stable, easily loadable, target the muscle effectively (just spinal flexion, so 1 exercise is enough) and most important that you LIKE.
In my opinion theses are the criteria that makes an exercise good or bad, just see what are your options and which is the best overall !