Shade products are bought on canopy size and sold on fabric, and the fabric is what decides whether the thing still looks good in two summers. The mount type (centre pole, cantilever or sail) determines where the shade actually lands.
Solution-dyed acrylic has pigment added while the fibre is still liquid, so colour runs all the way through. It is why some canopies hold colour for years of direct sun while surface-dyed polyester goes chalky in a season. If a listing does not say solution-dyed, assume it is not.
A centre-pole umbrella is cheapest and most stable but the pole occupies the middle of your table. A cantilever or offset umbrella puts the mast to one side, freeing the space underneath, at the cost of needing a much heavier base. A shade sail covers the largest area for the least money but needs fixed anchor points and cannot be moved.
Under-weighting the base is the most common umbrella mistake and the usual cause of a broken one. Free-standing centre-pole umbrellas want substantial weight; cantilever models want considerably more, and often sell the base separately. Check whether a base is included before comparing prices.
A tilt mechanism tracks the sun through the afternoon, which is most of the practical value of an umbrella. Vented canopies let gusts pass through instead of lifting the whole thing. Whatever the mechanism, close the umbrella when you leave, since wind damage is the leading cause of failure in this category.
Match the canopy to the thing you are shading, not to the patio: a nine-foot round umbrella covers a four-to-six seat table, and larger tables need a bigger canopy or a cantilever placed off to one side.
More depth: how the five common materials fail and what weather ratings actually commit a seller to.
A good rule is a canopy about five feet wider than the table, so the shade still covers people when the sun is off-vertical. A nine-foot umbrella suits a typical four-to-six seat round table; an eight-seat rectangle wants eleven feet or more, or a cantilever positioned to one side.
For a free-standing centre-pole umbrella, plan on a base in the region of 50 lb and more for larger canopies. Cantilever umbrellas need substantially more, often 150 lb or above, or a base filled with sand or water: their weight sits off-centre, so they lever over far more easily than they look like they will.
It is the best-known solution-dyed acrylic, and solution dyeing is the single property that most predicts how a canopy looks after a few seasons of direct sun. Whether that specific brand is worth the premium over another solution-dyed fabric is a closer call; what is not a close call is solution-dyed against surface-dyed.