I don't even know if I feel anything from energy drinks, but I keep drinking them because I like the taste. I mostly stick with the Arizona "herbal tonic", it's green tea with some citrus juices, herbs, and vitamins, but also a shitload of sugar/hfcs. 7-11 has a similar version with pineapple juice added that I used to get until the only 7-11 close to me went ghetto and barely decides to even open the store most days or will just close randomly in the afternoon. Last time I drove past they changed the name to "town name food pantry" so I don't think I'm going back.
As for Monster I love all the Juice flavors, especially Pipeline Punch or Khaos (the orange one, it might have changed names). The newest flavor I've seen the last month or so is Viking Berry, it's not bad either but the Rio Punch flavor before is better.