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No filter is the best.
However, I am living in a crowded city with air pollution most of the time. So I would always protect my lens with UV filters. I would not like to risk my front glass elements especially most of my lens are A*/FA*/LE/DA*. However, I am lucky enough that all my UV filters are original Pentax SMC filters except FA31mm whilst using B+W MRC.
In my environment, my opinion is for cheap lens, you may skip the UV. For expensive gems, UV always for protection. But one should use a high quality brand such as B+W, Hoya Super HMC, etc. However using a high quality brand doesn't guarantee you won't encounter any flare at all, it would only mininize the chance of occurence.
I have the experience of using DA*16-50mm with Hoya HMC Digital Pro UV, still encounters a flare against the sun in one pic and I am sure that such flare is caused by the filter.
Needness to say, best to take off any UV for indoor photos if the environment permits you to do so without risking your lens.
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