In case if you ever plan to upgrade to the CD-ROM unit, the CD-ROM unit also has all the functions that is included in the Turbo Booster Plus, which is save RAM + a/v outputs.
(I'm pretty sure you can use the CD-ROM unit's save RAM for TurboChip games that can use it, but it's been a good 8-9 years since I had the TG-16 CD player, so someone can correct me if I'm wrong.)