Adding my comments to existing debate, now that I've become the (somewhat reluctant) owner of an XT600 in addition to my DR600.
The following factors influence my view
1) I'm female, 5'11"
2) my comments are not meant to be technically accurate
3) Both bikes are pre 1990 and are STANDARD (both bikes can no doubt be modified to perform equally)
4) Approx DR experience: 2,000m (city, highway, rough offroad (disused quarries)
5) Approx XT miles: (only) 150m (city, highway)
Both bikes:
1) Are tough, have been around for ages and are still going strongly - very good, clean models are around
2) Require a level of mechanical expertise, to keep them well maintained and TLC'd. Buy a workshop manual.
3) Have a good range of after market parts available
4) Have a VIGOROUS following - so info, advice and bits are freely available
5) Are mechanically reasonably simple
XT : even this early on, there are the following - plusses:
1. Kick starts a MILLION times easier than the DR
2. Docile and predictable (power delivery feels very smoothly distributed across gears)
3. Hardly ANY vibration (less bits fall off, and bum doesn't go numb)
4. VERY stable on the road, even in high winds - feels like you're driving a ship
5. More parts available on Ebay. Cheaper.
DR Plusses
1. MUCH more "torquey" - lots of instant power available when you drop a gear - XT seems "flatter"
2. Feels physically "lighter" to handle, more responsive than XT
3. Clocks are much easier to read, controls easier. (XT's indicators are a pain)
4. Despite its size, agile and manageable even on rough off-road terrain (as long as you don't fall off!) - XT feels a bit more 'sluggish'
5. Very, very reliable:
Smashed it into a ditch, taking out two roadsigns - picked it up, straigtened bars and rode off - bike didn't even cough.
Fallen off hundreds of times - never broke anything - plastics just bend back, indicators wobble back, handle bars straighten, bike goes on.
Left outside 6 mnts in winter - started after a few kicks, ran fine.
6. Much, much more fun than XT
PRESENT CONCLUSION (I will report back, once I've got more off-road experience on the XT)
If you're going to do looooaaads of road miles, I would choose the XT. Even though its a bit like having to pick the station wagon, instead of the sportster... it seems like the sensible choice.
If, however, you'd rather have fun on the road, prefer more 'frisky', responsive performance, the DR is tops.
Can't say yet - but believe the XT will not be as manageable as the DR offroad... but then, I'm biased.