2, 4, it all depends on what your applying it to.
track? 2-stroke
trails? 4-stroke
cruising Daytona? big V-Twin 4-stroke
Blowing grass clippings off the driveway? 2-stroke
I have a wide collection of pretty much all of them (heck I have a diesel tractor and truck). I like them all for what I use them for.
Andy hates it every time I send him a message of my new purchase as it's mostly a 4-stroke but for racing, nothing kicks you in the pants like a 2-stroke.
For single track trail riding I had a 2-stroke that needed to clean the plugs more then I wanted. That and doing single track rocky climbs the 4-stroke YZF250 is nice (yes, the tractor mode means I can climb pretty much anything).
Of course the KX100 big wheel I had was fun on the flat track. But when the power band kicked in, you didn't want to rear to catch, just prayed it kept spinning till the next corner. That an out in the fire roads and motocross tracks it was fun.
My custom that I built has a 100ci V-Twin in it. Fun for just relaxing on country roads, or showing off at places like Daytona Beach for bike week.
The DRZ400SM is a kick in the pants on the twisty mountain roads, and it's actually nice to commute on.
The 06 Yamaha R6 LE I just picked up was for a purpose. The handling/size feels a lot like my RS. Makes absolutely no power until about 10K, then it kicks in (not as hard as the RS, but it does kick). Not sure what I will do with it. Probably spirited street riding, and track use so I am not putting un-needed miles on my RS just to learn new tracks. Or I'll just sell it and make some money on it now that spring is here.
I think it comes down to I'll pretty much ride anything with two wheels and enjoy it for what it is.
All my yard power tools are 2-stroke (with exception of the mowers, those are either diesel, or 4-stroke). Nothing like strapping a 2-stroke motor to your back to clean your drive way or walk ways That and I need something to run my old race mix through when I get home. The lawn mower doesn't like it as much as the blower and trimmer.
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Charles Gallant