Elastration is the banding of the testicles restricting blood flow and resulting in removal of the testicles. This method is commonalty used on farm animals, sheep and goats in particular.
Special tools and bands are designed specifically for this task, and this question is focused on the health risk comparison of recognized appropriate surgical and elastration neuter techniques, by trained performers.
Looking for reliable references on the actual occurrence of infection and/or complications of surgery neuter and elastration, either as a side by side compare, or from different studies which allow for comparison. Preferably on identical species, but if not available, complication rates on optimal species (surgical = dog/cat: elastration = goat/sheep) would be acceptable
Note; there are some ethical arguments against the use of elastration, this question is specifically looking for empirical evidence related to these two techniques for neutering.