The simplest way to understand these two services is depth versus breadth.
TextVerified goes deep on one country. It sells only US numbers and describes them as real US mobile numbers backed by physical SIMs, not VoIP. That matters because many US platforms — banks, payment apps, dating apps, ride-hailing — run a carrier lookup and refuse VoIP numbers. TextVerified offers one-time verifications (SMS and voice), short rentals of 1–14 days, and long-term month-to-month rentals, and it says customers anywhere in the world can use the US numbers.
SMSPVA goes broad. It lists 60+ countries and focuses on the most popular apps. Its homepage says its catalogue includes both numbers from real SIM cards and VoIP numbers, so line type depends on what you order. It offers one-time activations and rentals of days, weeks or months.
If your world is American apps, depth wins. If you manage accounts in several countries, breadth wins.