I think you should keep the damage indicator, shipwreck world gen, backpacks, and the GUI modifier. You should also add Zan's minimap, SEUS Ultra shaders pack (if your computer can handle it), and finally, Flan's WWII mod, a must play with. In conclusion then, if you take anything out of this, get Flan's mod. By the way, what is your channel going to be called?
PC is better because it is way more customizable. Second, you can play more games on a PC than any other computer. Thirdly, a PC has a lot better performance than a Mac, so you run more texture packs, mods, shaders, and so on. So, in conclusion, the PC is better. (Only Windows 7, not including Windows 8, which looks horribles and is a pile of crap.)