.You can opt any one of them, but before finalizing you need to check their portfolio
Best advice that could be given when it comes to choosing a designer. Ever client reviews are spotty as the client and client expectations would also need to be provided for the context of the review to be clear and accurate ( also some designers will filter their bad reviews) In short relying on 'social' is not very 'scientific', focus on the portfolio. Specifically, see if the designer matches your style and needs.
Of course this means you need to know what you want and need ( more than "a good logo that looks good and works")
Keep in mind a logo will go on almost everything your company does. It's weird that one would only want to spend $300 for a logo but be willing to pay $2000 for a site which MUST INCLUDE said logo. Be willing to invest on your brand identity or wait till you functional part is working and generating money to put the necessary time, effort and yes cash into developing your logo.
Changing logos because they didn't fit... is a bad idea. see all of the above ( and thus why it takes effort and $$) to get it right
OH and revisions aren't the fix all either. It's better to get 3 good choices for $2000, than 2000 bad choices for $300 (I am trying o illustrate a general cost to revisions offered ratio, not to say how much much logo services should be in $) . Not only because chances are that $300 wont create a good logo or identity. ( I didn't say 'motivate' because time is money, and as a business if you do something cheap you need to do it in bulk.... and a 'bulk-identity' is a contradiction in terms). MORE OVER YOU NEED TO BE INVOLVED in the process. Branding is a science as well as an art. So if you get a billion cheap revisions, you ( the client) can't really spend enough time fine tuning and scrutinizing "why it work ow why it doesn't"... instead of saying "next!" and hoping to get lucky. Think of it this way: if you got 400 logos and spent only 3 minutes glancing at each one.... you spent 20hrs of YOUR TIME (how valuable is that t you?) poorly choosing a logo. On the other hand if you got 3 GOOD, well executed, concepts and then spent a FULL HOUR ACID TESTING EACH ... you only spent 3 hours of your time and probably made a better choice from much better options.