I believe Heat tracing of pipe to be an Art.
Jacketed pipe and steam traced/Contro both have their place in process.
Jacketed pipe is a pain to repair or weld on. And then you have the issues of Valves in the system. But generally has decent heat transfer.
Traced/Contro, if accurately engineered for optimum heat transfer can be an advantage in not having to deal with jacketed piping issues, lending itself to more flexibility.