There are a variety of considerations, including durability of outside displays, odor, environmental requirements, drying time, head replacement frequency/cost, ink cost, media range, and sustainability. Latex fades earlier when outdoors (still lasts several years), but has no odor, poses fewer environmental or sustainability issues, prints well on porous substrates, and dries quickly. What it doesn't do is print on rigid surfaces, since latex printers are currently roll-fed. Solvent uses less expensive ink and the equipment cost may be less expensive. If you want maximum flexibility, consider a LED UV printer that can print both flatbed and from rolls.