Does it matter that I'm using two different brokers or should I use just one broker with both platforms?

The full question is: 

I have an FXCM MT4 demo account installed, where, like you mentioned, I'm running the indicator. I'm also using an InterTrader demo account on my smartphone where I input the Bullet trading signals. Does it matter that I'm using two different brokers or should I use just one broker with both platforms?

Most brokers use pretty much the same underlying prices and since Pips Predator tells you based on prices  when there is a higher probability of a move, it doesn't matter you use MT4 from say FXCM to get your signals and trade through say ETX. 

However, in an ideal world, since we developed Pips Predator on the MT4 from FXCM, you should use FXCM MT4 and in an ideal world you would place your trades through MT4. But as I have often mentioned, MT4 is complicated to trade through and so I tell most people to use FXCM Trading Station.