Neither. Both of those GPUs are so slow, especially in their DDR3 variants, that you might as well not have a discrete GPU at all (this means that they're both significantly slower than the integrated on-CPU graphics of Intel's Skylake and Kaby Lake CPUs). In addition, the GT 210 is now no longer supported at all in any newer version of Premiere Pro CC (2015.3 or later) for GPU acceleration (this means that the renderer will be permanently locked to the software-only mode) since it is based on the now-obsolete Tesla architecture, and driver support has ended entirely (outside of archived driver releases) on all Tesla-generation GPUs since April of last year.
And since both of those GPUs are slower in Premiere Pro than even a freebie Intel IGP, if you absolutely MUST have a budget discrete CUDA GPU, go for a GT 1030 instead.
By the way, you posted the same subject in the main Premiere forum as well. Double-posting is frowned upon in all forums.