In this case, I would safely take SP3k. It is most likely more to your taste. It's a more emotional sound you're talking about.
You understand everything correctly. The SP3k's bass is softer and more integral, which is why it is perceived as more massive. At the same time, LPGT is stiffer and more accurate, but in some cases it has less mass, conveying what is in the record.
Many Thanks for the detailed explanations, it has definitely got me more interested in giving the SP3000 a try
One more question, if you don't mind... Is the SP3000 volume wheel accurate without missing any 'volume change steps'?