the plain answer is: no. There are more facets to the answer you are looking for. In my dental lab we run a vacuum centrifugal titanium casting machine with an arc melting feature, a vacuum casting machine with induction melting and a centrifugal casting machine for flame melting. From a physicist’s point of view, backed with this set of means of production, the best choice for dental (or jewelry) size casting is a vacuum centrifugal casting machine with induction melting. From a shop manager’s point of view, the mid-size five digit asset required for this is not everybody’s collar size, compared to a broken arm centrifugal casting machine for flame melting. With these constraints it is obvious that everything being used in a shop is a compromise in between.
When we started operation with a broken arm open flame casting machine we always wondered why such a big space is wasted for casting of such a small amount of metal. Not to mention what happens if the broken arm is not balanced properly. It took a few months to develop our approach to lost wax centrifugal casting which is registered under US Pat. # 6880615 and others. By this approach we reduced the space required down to 1/8th of a conventional broken arm machine with a capacity of up to 450g gold without the need of balancing. The self-contained housing makes it one of the safest centrifugal casting machines, as long we are not talking of turbine parts or engine blocks. From a technical point of view, it’s easy to mount this arrangement into a vacuum chamber with an induction coil, but the price tag for such a system would significantly reduce the target customer base in two niche markets. Melting with a resistance heating unit was never an option because of the constraints of melting temperature, hence the torch option.
Back to the roots of your subject: if you are afraid of a heavy duty flame and fine with the temperature range of a resistance heating furnace and are willing to wait until it reaches casting temperature: go for the furnace. If you don’t want to waste your time waiting for the right temperature and trust your experience in your eyes and fingertips: go for the (right) torch. If a vacuum centrifugal casting machine with induction melting is in your budget: by all means, go for it.
Always keep in mind: no customer of yours will ever ask how his/her piece of jewelry was made.
Being in business for decades now, there are two lessons I learned the hard way: the best product of its kind ever is worth nothing if nobody is willing to buy it, and life is not a bowl of cherries. My 2¢.