The one thing worth knowing before you buy a single bar handle is the length and the hole spacing, called the center to center measurement, because that number has to match the holes already drilled in your cabinet door or you are filling old holes and drilling new ones, and that is a job that shows under the wrong light no matter how careful you are with the wood filler.
Bar handles are plain by nature, that is their whole appeal, so they tend to go wrong next to anything fussy. A kitchen with ornate raised panel doors, beading, or carved details usually wants a knob or a cup pull instead, something with a bit of shape to match the woodwork. A bar handle on that kind of door looks like it wandered in from a different house entirely. They belong on flat or simple shaker style doors, on furniture with clean lines, on anything that was built without much decoration in mind to begin with.
If you have no hardware opinions yet and just need a place to start, I would go with a simple bar handle in a matte finish, either black or a warm brass rather than shiny chrome, and I would buy one extra beyond what you need. Cabinet doors vary by a sixteenth of an inch more often than you would expect, and having a spare on hand saves a second trip when one handle sits a touch crooked and you need to check it against a fresh one before you decide if it is the door or the hardware at fault.
The day these arrive, check the screws that come in the box before you check anything else. Bar handles come in different lengths and the screws are usually sized for a standard door thickness, so if your cabinets are thicker or thinner than average, which happens more in older houses with doors that were never quite uniform to start with, the screws either poke through the back or do not reach far enough to grab. I have stood in a kitchen holding a handle with screws two sizes too short, no amount of tightening fixes that, you just need the right length from the start. Also run a hand along the underside once it is mounted, a good bar handle has no sharp seam where the metal was joined, and a cheap one almost always does.
This is the right hardware for a kitchen or bathroom that already has clean, simple cabinetry and just needs something honest to hold onto.