Firm feel k frame reinforcement

Question to all who have reinforced a factory K-member: What is your opinion on the strength of a reinforced factory K-member compared to an aftermarket tubular K-member?
Which would you prefer to use for street use with torsion bar suspension?
I do not have either welding skills or equipment so would have to farm out my factory K-member for reinforcement.
Thanks in advance for your input and info.