Depends what you class as better and what you're looking for from your tan solution.
Why not ring or email Suntana and ask for samples? Why are you thinking of switching? More info may help Suntana users identify if this is likely to be a good tan for you.
In the meantime you could always look at the 'Let's see your tan' thread and decide whether you like the look of the results. Really you need to try it yourself as you know your client base and you can then determine whether it's suitable based on your experience of it.