They're different tools- the first two are software, while the third is professional human proofreading.
Dedicated human professional proofreading is going to be the best service, but also the most expensive. I haven't looked at GingerSoftware yet, but I have used Grammarly and found that it is a useful tool and could help someone to improve their text. The standards of the software tools generally is improving and have moved well beyond the days of grammar checkers that were inaccurate and annoying. However, for important documents, I would go for a human every time, but cannot say whether LinguaLearn are better than any other service, and there are loads to choose from:
Here are a few submitted to our database: Proofreading - ESL Web Directory - UsingEnglish.com (Submission is not a guarantee of quality)
Some offer samples, so test them out and see which suits you best.
We're a discussion forum and people will do some proofreading, though as it's done on a volunteer basis, there are no guarantees that a piece will get looked at. Therefore, I would use us for things that are not urgent and short.
Here's another I looked at: Twilocity - Tdol's English Language Blog
Grammarly: Grammarly - Tdol's English Language Blog