Start with texture
Look for a base that sits smoothly over moisturiser and does not gather around dry patches by midday. A satin finish is usually safer than a flat matte finish.
Check the claims
SPF in makeup is helpful but rarely replaces a dedicated sunscreen. Treat it as backup unless you apply the correct amount and reapply.
Compare shade behaviour
A sheer product still needs a believable undertone. Test around the jaw, then check in daylight before deciding.