I don't mean this to come off as me being a d!ck, but if you don't know what it stands for, that's usually a pretty good sign that you shouldn't be doing it.
That being said, it's ephedrine/caffeine/aspirin. As you've already brought up, some people choose to cut out the aspirin due to the blood-thinning properties. One of the ways I've seen it listed to try is running EGCg (green tea extract) along with it and keeping plenty of fish oil in your diet to help with heart health.
As far as brands go, it's debatable. There are really only 2 things to consider from the ephedrine side: amount and type. You have ephedrine hcl and ephedrine sulfate. Most products are dosed somewhere around 12.5g or 25g. Which is more effective is debatable.
And just out of curiosity, how old are you and how long have you been training? Have you not done much weight-training? Because 6'6" and 225 sounds like a pretty good range or even light, if you had a lot of muscle on your frame.
Hope this helps.