Excellent, a completely new topic that's never been discussed before. Oh wait........
You'll have to do your own arithmetic on whether Stars or FTP is better for your playing volume, collectively considering your volume of play, your different win-rates on each site, how the contributed vs. dealt issue will affect how many loyalty points you accrue and consequently how each site's bonus scheme will reward you. It may work out that even with reduced bonus on one site you may be able to earn more over all because your actual bb/100 is much better.
For instance if you're a nit then you may be better at stars, if you're a lag then maybe FTP. Like a lot of questions in poker, the true answer is ..... it depends. Work it out for yourself.
Oh, and as for software, Stars >> FTP ainec.