@OP, please stop posting a bunch of threads, and review the OD guidelines. Onetwo, you need to read the guidelines as well.
Now, I haven't read this thread in it's entirety yet but I'll probably end up closing it as we don't allow these comparison type threads, if you guys want this to stay open i suggest we stick only to discussing harm reduction related information, as soon as we start glorifying drugs, I'm closing this.
My two cents, I don't enjoy amphetamine period. Methamphetamine on the other hand, I enjoy it very much in it's pharmaceutical pure-dextro formulation for it's incredible therapeutic value when used with the utmost respect and responsiblity, keeping doses well under 30-40mg, taking extra measures to prevent neurotoxicity (as covered in more depth in Advanced Drug Discussion).
The dextro form of amphetamine is a step up, but I personally much prefer d-methamphetamine to d-amp, by a landslide.
It's very important to keep your dosing low, and to take extra precautions to maintain optimum sanity, hydration, sleep, hygiene, nutrition, and supplementation of electrolytes, it's even more important that you go out of your way to be safe and responsible with your amphetamine use.... especially if you are abusing them instead of using them therapeutically.
I would highly recommend all amphetamine users invest in chelated magnesium, 300mg capsules are the best. Also take with it, a complete multivitamin, vitamin D (be sure to take this with Magnesium), 3 grams of raw unrefined non-processed virgin coconut oil, taken orally, with a nice healthy meal or at the very least, a tall glass of milk or water.
Milk and more alkaline environments in general make amphetamines potentiated and harder for your body to eliminate, and the opposite/inverse is true also. If you have an acidic, low pH GI tract, then it will metabolize/eliminate ampheatmines faster, making them less effective, so stuff like orange juice weakens the experience, and conversely, a bit of baking soda will drastically potentiate the amphetamines, so be very careful.