The chop saws and proper cold saws are fast and usually cut more accurately -- as Digger suggests -- than a cheap bandsaw. But they can eat blades if you use the wrong material in them.
The metal-cutting chops saws (Fein, Milwaukee, lots of options) typically typically run a 10" blade around 1300 rpm. There are portable versions as well. That works very well for aluminum and can do for a while if not abused (e.g. actually chopping down on edges) in mild steel. But a proper cold saw with a much higher cost, even more expensive blades, and a much lower rpm is what you'd want for cutting a lot of steel.
A metal-cutting bandsaw, from cheap to expensive and even automated, will have lower speeds available, longer blade life, maybe coolant.
If most of your work is aluminum, the 1300 rpm chop saw could save you some time. I'd still want a bandsaw for more difficult materials, including your titanium tube. The cheap chop saws wil work on steel, but expect to buy blades more often than you'd like. Don't know about titanium tube, I'd think it would be problematic on a chop saw.