I cant say the best becasue Ive tried a lot but not all brands so I will give you my personal preferences after years of trial and error. My absolute faves for wearing yaky hair ( I only wer micros) are Outre premium and Dreamweaver model model. I rarely do curly hair but when I did last I used Dreamweaver Ripple Wave- It was the best curly/wavy hair Ive ever had. In the pkg. it is like a bodywave. Pretty but unimpressive as its not curly BTU when u wash ?!?!?! It turns into juicy curls. I love so much I was washing the ends every other day. I used curl creme--Beyond the Zone Noodlehead from Sally's to maintaint he curl and I plaited every night when I went to bed. It was so light and I took out only because I was tired of the color not because worn out. It got better the longer I left it in. it had no tangles, no loose, sheddinghairs etc. no problems at all.
1)Synthetic hair lasts much longer than human hair . However it looks unsightly when your hair grows out because it tends to be shinier and more noticeable.
2)Human hair can be re-used but IMO would be difficult to try to keep aligned as you take them out and then wash and re-position to put back in. Someone posted that they do re-use their hair tho . I dont . I also cut mine to where my hair is when Im taking them out to make the job faster. Plus, I like new hair !
3)The only reason I do so much to my braids is becasue I know I can repair them since I do them myself. But I shampoo every week and condition the extensions only. I spray a leave in conditioner in my scalp and let it run to the ends of my real hair. I also moisturize my scalp with hair balm and/or Dr. Miracle's Hot Gro.
4)You should be very careful when washing/conditioning as human hair expands when wet and you have to be careful manipulating it as if you are too careless you will have a handful of braids in your hand. I dont scrub or rub really hard and I dont pile in a bunch of products, etc. I concentrate mostly on my scalp and where my natural hair ends. Other than that, Im lighthanded with all other products. I really like Carol's Daughter hair products-the hair balm and Spray leave in Black Vanilla conditioner helps my scalp and keeps my hair smelling luscious. Other than that I use Dr. Miracle's for my 911 areas and serious conditioning.