Just a caution: often attributed to Mark Twain, "There are lies, damned lies, and statistics".
Comparisons are difficult. For example, the airlines (which are very safe by any measure) love to quote "fatalities per passenger mile". This statistic suggests that your risk doubles if you take a flight which is twice as long. But the truth is nothing like that. So few accidents begin in cruise, compared to takeoff, climb, descent, and landing phases, that a short flight with multiple intermediate stops is in fact, statistically, more risky than a long non-stop on the airlines.
That being said, I believe the best comparisons indicate the risk in light aircraft, on average, is closer to the risk on a motorcycle than in a car.
And the risk for experimentals, on average, is worse than the single engine fleet. But perhaps similar to the risk in high performance singles. (Same statement is true for the twins vs singles comparison).
The good news(?) is that, for private aircraft, so many accidents are attributed to bad pilot judgement that your safety is, to a very large extent, in your hands.