Depends what you mean by legacy. If you mean well written c or Java code, that is well tested and clean. Then I'd prefer to then a modern JavaScript applicatio

Depends what you mean by legacy. If you mean well written c or Java code, that is well tested and clean. Then I'd prefer to then a modern JavaScript application without tests. Legacy to me means applications that has turned into a mess with no tests. This can be a recent application or old.