A little better. A lot better. These are value judgements. The fact is that in developing the G series TTs, Technics upgraded every aspect, most especially including the platter and motor (changing from an iron core type in the old SL1200 series to coreless in the G series). The original entry in the G series sold for nearly $5000. It has always been my opinion that Technics made a big mistake when they decided to make the G series look pretty much like the old SL1200. This encourages diehards to maintain that their old SL1200 is just as good. Further, they muddied the water by producing less expensive versions of the G series, taking away some of the innovative features of the top of the line in the process but also thereby making the TT affordable for a vast number of audiophiles. That was probably good marketing but it gave further encouragement to the SL1200 aficionados. It's foolish to argue about better or not better. If you love your SL1200, then love it but don't labor under the delusion that it is on par with a top of the line G series TT. Just don't. It isn't. And the SL1000R (the SP10R with plinth and tonearm) is one of the great TTs available. Also, if you hate DD, that's fine. Don't buy one.
Technics SL-1300G Turntable issues
I recently purchased the Technics SL-1300G. I like the sound of the turntable. Unfortunately, I found the common complaint that the lift mechanism feels cheap. Additionally I found a perceived quality issue shown below. The silver bands on the top and bottom of the beveled platter edge vary in width by a mm+. In my opinion it makes the table look cheap, not the quality you would expect at the $3300 price tag. Note the gap between the platter and the plinth is uniform as the platter rotates. Would you return the TT hoping to get a platter with more uniform machining?