Brian, I have owned (and used) oxy-acetylene torches for over 40 years, and owned oxy-propane for around 4 years. Here are my 2 cents.
First, if you will only use this occasionally and want to do brazing and welding, do yourself a favor and go with oxy-acetylene. It burns hotter, uses less o2 for cutting, and is more suitable for torch brazing. The torch sets used to cost less too but this may have changed.
However, you mentioned primary uses being heating and bending, and this is an area where oxy-propane may be better.
A primary benefit of oxy-propane is that propane costs less than acetylene, and is easier to find. However, oxy-propane uses much more o2 than oxy-acetylene, so even though your fuel is cheaper it is offset by the fact that you have to buy 3X more oxygen! (4.3:1 ratio for propane, versus 1.2:1 ratio for acetylene)
Oxy-propane is not a good process to use for steel rod brazing. It has something to do with the chemistry of the fuel not being well suited for welding.
Oxy-propane requires a T rated hose. Fortunately this hose is also rated for acetylene. Standard R hoses are not rated for propane - only acetylene.
Acetylene burns hotter than propane, and you will use less oxygen.
Propane cutting and heating tips are definitely different than acetylene. I've used acetylene tips with propane and it did not work well. If you go with propane, buy the correct tips for it.
If your main use will be heating / bending, then propane may be a better option (depends upon how thick the metal is being heated / bent). Heating tips (aka Rosebud's) work better off of propane, unless you have an extremely large rental acetylene tank. The issue here is that acetylene has to be converted from a liquid to a gas before it leave the bottle, and the conversion rate is sometimes not as fast as what's needed for a high flow rosebud. That can cause liquid to be drawn into the torches which can represent an explosion hazard.
You will want to size your regulators and torches to the thickness of the metal being heated / bent. Standard 3/8" and under, an inexpensive acetylene set will be fine. However, if you want to heat and bend thicker metal, you will need to upsize to a torch head that can support a larger rosebud and regulators that will flow more.
How thick of a material do you plan on bending?