I started a thred similar to this called cube progression just to see what cube ppl started out with and what they ended up with and most if not all say they started with a RUBIK's brand cube. So if there here at this site and researching speed cubing then most likely they already have a rubiks brand cube. But if not and a bEginner should ask me I'd say get the best cube they can find. Honestly what's all this garbage about appreciating your speed cube more. Who the hell cares about what I appreciate more does it matter if I still get good times? Also this argument about accuracy what does it matter how accurate I am if the cube I use all the time doesn't require that accuracy?why do I need accuracy if my cube cuts more then a whole cubie? And just because you start out on a slower/rubiks brand cube does not mean youll be more accurate, i started on a rubiks brand cube and found when i went to a better faster cube i had a problem with over turning because i was used to applying more force to turn the cube so i had to learn to take it easy and not do that, even though when i got the new cube my time still went down considerably immeditatly giving another point to who the heck needs accuracy.That is a perfect exsample of "bad habits" learned from a rubiks cube. As well i dident learn proper fingertricking because of the major difference in the force needed to turn the face.Also the whole comparing cubes to other things does not make any sence. With most things the better the prop the more expensive it is so it is a good idea to start out with something cheep just incase they don't like the hobby or what ever it is they didn't waist a hole lot of money on something they will never use, this does not apply to speedcubeing because most of the time if not all of the the time the better cube will be cheeper then the RUBIK's brand. And the comparison of the baseball bat using a donut makes o sence as well they only reason they do that is to build up the muscle in there are so that without it they can swing faster, there is no reason to do that with cubing because it doesn't take a lot of muscle to turn a cube properly.
So in conclusion it IS a good idea for beginners to get the best cube possible if not for anything else then because when you do your times are only limited by your ability, which forces you to look at that ability and make corrections consciously, forcing you to learn the proper way to turn the cube instead of just getting that ability because that what your used to as well as I really don't see what getting used to the RUBIK's brand cube would do anything at all good for your cubing in the future. Every cube is different and takes some time to "get used to". If your used to using a RUBIK's brand then you might not perform well on a zhanchi but then again if you used to a zhanchi then you might not perform well on a RUBIK's brand. Like I said all cubes are different.
So beginners go ahead and buy the better cheeper cube! Rather then wast your money on a piece of crap RUBIK's brand cube that you'll end up never using anyway. Now if you want to be a collector then of corse get a RUBIK's brand cube just for the nostalgia of it.