I like AL tanks I have 2 al 80s I use, I dont think I would even think of steel if I were doing a lot of saltwater dives.
Steel is heavier so carrying your gear is going to be more of a chore.
Price for steel is going to be higher so that should be considered also.
one more thing I thought of, if you end up traveling and need to rent tanks more than likely it will be an AL tank. your weighting is going to be different from AL to steel.
So I guess my vote goes to aluminum tanks
I have always thought of HP steel as more commercial than rec diving but thats just my opinion.