Triangle chalks are snooker chalk. Master chalks are billiard chalk. I used both. There are two totally different kind of chalk. Triangle chalk is much softer than Master chalk. If you use Triangle, you need to chalk your tip more often. To most poolplayers I wouldn't recommend to use Triangle chalk to play. You will have lesser grip when using Triangle. To me, I like the Triangle chalk. I use Triangle on my playing cue (it's a carom cue with a 12mm tip, I don't like too much grip for normal shots, with my playing cue I already can make tons of english) and Master on my breakcue.
I think it's better if you just order some Master chalk.