I would recommend Propionate for those looking to stay on long term, using a very small gauge pin 25+ rotating sites often. The downside is more frequent inj hence more scar tissue but this can be managed by a tiny pin. The advantage is less unwanted bloat/water weight, which although has a minimal impact it's easier on your kidneys and BP. Also many go on HRT to combat symptoms of ED, and BP is a strong culprit to this.