In this environment, UVXY and TVIX are perpetual r/s offenders. When I hear you say that it will r/s again next year? My first thought is long term puts. That way, the decay works in our favor.
I've personally experienced TVIX going from the low $16's, to over $100 a share in about 2 weeks of bad market conditions. When the market truly dumps, there aren't many better choices. We aren't in that type of market yet.
I've experimented with both the log scale on and off. The argument for using linear, is that the log distorts the charts. I agree with that to an extent. It does screw up the angle and appearance.
By using both, and studying the results? I've found that I prefer the log on. The majority of the trend lines still hold true, and the overall appearance is crisper and cleaner.
I won't say one is better than the other. I just prefer the log on.