Originally Posted by Dingo

Only the server can control the client you use.A client has no control over a server.As you said "certain environments" which I presume you mean server set-ups.I've never come across servers restricting client speeds (banning yes)..

You could never test something like that..Impossible..You would have different results everytime.Even if you use a seedbox your results would be dependant on the sources at the time you download.Those sources will change for the next person when they download.If you download locally thats dependant on your isp,so not really sure how those tests were performed,but totally impossible to record.

I think the same.....it is impossible to make a proper comparison. There are too many variables. However, an experienced user can (for example) enhancing the speed of download / upload but, in my opinion, the benefits are almost miserable.
For myself I can only say that I believe that rtorrent is the most widely used. And I must say ,from my experience, that is an excellent client. Then, everyone has their own preferences ...... you just have to try. With Seedboxes.cc you can change the client with a simple click of the mouse !!