The TGM bass is cheaper and in a more sleek and worthwhile package. The body is slightly smaller and it also spots a J+J pickup config. Recent batches have vast improvement on the neck. Early models neck are not as well made.
The only drawback is that now the TGM is out of stock from the distributor, I just sold my last piece this week. So if you see a good deal in a shop which still have the stock, it's quite worth the money.
Samick has always produced guitars which are quite ok quality, so if you don't mind the more traditional look, it's also a good buy.