I dive with 100s that are LPs. However I use a drysuit and am a bigger guy so less weight that has to go into my BC weight pocket. Don’t take this the wrong way but if you are a smaller build or don’t want to lug around a heavy tank go with HP. However HPs cost more, and not all filing stations can do the 3,000 plus PSI.
Also depends if you are looking at new or used. I have seen a lot of used LPs.
Hope this helps!