Choosing the best kind of key cutting machines or key duplicating machines is important for various reasons. Primarily, key cutting machines need to provide precise and accurate cuts, ensuring that the groves in the keys are cut accurately and that they work smoothly in locks. For some locksmiths, the speed by which key cutting machines can process a job is more important, particularly in high volume, high demand applications. 

Other equally important factors to consider in choosing the best key cutting machines include versatility (higher end machines could support wider types of keys which allows expanded service offerings), ease of use (who has time for complex machines that have fewer automated features), and longevity (more expensive key cutting machines are typically made with higher quality in mind).  

So, when comparing specific models like the Ninja Total and Triton Plus Ultimate Edition, multiple factors are being considered including what types of keys are being supported by each model, what cutting methods are being used (laser vs traditional), after-sales support like warranty and customer service options, and user reviews which are very helpful in providing insights into each product's reliability and performance. 

Ultimately, what the 'best' machine is depends highly on your specific needs and budget. If your business is running a high-volume high-demand key cutting business, then picking the more durable, and feature-rich option might be a better investment in the long run.