Now to the second part of your question.
As far as which feeder is the best, that gets down to personal choice and which one gives you the most control. I know some people only tube feed their orphans because it's faster and they know exactly how much formula the kitten has taken in. Done properly, it's perfectly safe. I only use it in emergencies or with sick or weak kittens. I also think the kitten gets a great deal of benefit from the sucking action. Besides, to be perfectly honest--I can't believe how strong some of these kittens are. I often have a problem holding him still long enough to do it.
If the kitten teeny tiny, I either tube feed or use a dropper with a small tip. In my experience a bottle nipple is just too big to get in the mouths of these little guys. I start out by placing a single drop on his tongue and waiting for the kitten to swallow. They figure it out pretty quickly. It doesn't take long for him to start sucking on the dropper himself. Let him control the flow. Don't just squeeze the formula in his mouth. He could choke. If he doesn't "get it", take him to the vet and learn how to tube feed.
As he grows he'll naturally need more formula. At 8 to 10 days, I switch to a bottle. Kittens get really hacked when their concentration is broken by you having to stop every few seconds to refill the dropper.
I use one brand of bottle and another type of nipple (teat for those of you across the pond.) I really like the Four Paws Nurser bottle because it is soft. That makes it easier for the kitten to feed. However, I also prefer the nipples from PetAg, the manufacturers of KMR.
Other people swear by feeding with syringes. I have used them in a pinch, but I always fear that I will accidentally push the plunger too hard and force the formula into the kitten's lungs. I'd suggest practicing your flow before actually feeding the kitten with a syringe (or a dropper.) Don't continue to use the same syringe over and over. I've noticed that the rubber plunger will dry out and hang. If it catches and you press hard to make it move, it could drown your kitten.
Ultimately, you have to decide which method gives YOU the most control.