I think it would always bee better to write independently if possible rather than for any of the companies that are being discussed on here. They are not all outright frauds or scams, but many of them are, and even the better ones have certain defects. An independent writer gets to keep 100%, instead of letting one of these companies take 50-60%, which always left me with the feeling of being ripped off. Others make the writers bid on orders instead of simply selecting them, so one never knows from one day to the next how many orders you might get--if any. Some sites pay very well, especially in the UK, but if their prices are too high they don't have many orders. ManuscriptServices in the UK was like that, since their rates of pay were always quite high, but it's hard to get more that 2-3 orders a month because there just aren't that many. On the plus side, they always pay on time and the exact amount that you earn instead of scamming the writers, playing all kinds of fun and games with "fines" and all that.
I have had a great deal of experience with various companies over the years, and there are some that I would tell you to avoid completely as outright frauds, such as Academic Knowledge and essaywriters.net[DND*] under its various names. I have also been a member of Researchwritingcenter, but the pay was so low that I never even bothered to take an order, not to mention the problems various writers have had getting paid. On the whole, I just avoid the companies paying $3-8 per page because the writers end up doing a lot of work for very little money.
So overall, it would be better to work independently, but then you would have to take on the entire hassle of dealing with customers directly, trying to collect payments from them, including those who are just trying to scam you to get a free paper. It goes on all the time. After doing this type of work for years, I would say that the best thing about it is to freedom to set your own hours, and not to having to show up in an office every day wearing a suit and tie, but it also has its share of drawbacks.