This is the most common question I guess. Development vs. Testing. Career scope in Testing. Either way the question is same.
Now-a-days there is a crowd of Manual Testers in the market, so that’s not in demand (supply is more ;-)). But if you ask about Software Testing as a complete technology - Yeah! That has a really good scope only if it’s specialized - HP UFT, Selenium, Mobile, Android, iOS, Database, ETL, Performance - you need to learn ANY specialized Testing Type and then - Sky is the limit.
Summary - Don’t just get stuck at Manual Testing (its crowded). Go for specialized Testing Type!