Knowing how to use the meter you have is more important than buying the best meter.
My favorite meter for landscape photography is a spot meter. I find that landscapes can often have complex lighting that can push the limits of your film. Sometimes the light range will go beyond what your film can handle normally, so you'll have to compensate in development. For those times, it can be really important to nail the metering. Spot meters can be expensive, but a used Soligor digital spot meter is a pretty accurate and cheap way to get into spot metering.
Now I will say that I shoot a lot of medium and large format with landscapes. Those formats take a lot more time to set up than your typical 135 camera, so I don't mind the fact that spot metering takes a lot longer. So if pulling your phone out to meter the light takes too much time, a spot meter probably isn't what you're looking for. If time savings are what you're after, I'd look for a hot shoe mounted reflective light meter. Maybe something like a Sekonic L208 or Voigtlander VC Speed Meter II. They won't be as accurate as a spot meter, but they're a lot more convenient. You may also consider an incident meter. I've used them for landscapes, and assuming you know how to use one on a landscape, they can work pretty well too.
In any case, the best thing to do is once you get your light meter, take it out with a digital camera and practice metering scenes with your meter and compare them against the digital camera. This is especially important for a used meter, as it can tell you if your meter is off and by how much. I have several very old selenium meters that measure pretty accurately, other than the fact they're a stop slow. So long as you're aware of that, they work great and they were cheap! It will also allow you to figure out any other shortcomings of the meter. For instance, some of my reflective meters can get fooled by a bright sky. But I can still get an accurate reading by metering the light off the palm of my hand (and backing off a stop) with them, or just metering the ground. You're using the digital camera as a quick reference tool to check yours and the meters capabilities. Like I said, knowing how to use the meter you have is more important then buying the best meter.