Both the Thorens TD-1600 and the vintage Thorens TD-125 MKII with modifications offer excellent sound quality and build reliability. The TD-1600 is a new model with modern engineering and materials, providing a refined sound and improved components. On the other hand, the vintage TD-125 MKII, when restored and modded with a Sorane TA-1 tonearm by Vinyl Nirvana, can offer a unique and potentially more characterful sound. However, the vintage option may require more maintenance due to its age. Ultimately, it boils down to personal preference. If you value modern engineering and convenience, go for the TD-1600. If you appreciate vintage charm and potential customization, the restored TD-125 MKII may be your choice.