Does Spectrum support only EEM 8.4 SP4? 12.5 version of EEM are already out and many of your customers would be expecting the support for it from Spectrum.
Spectrum 9.3 supports EEM 8.4 SP4 and EEM 12.5 if no multi-domain support is required. Spectrum 9.4 supports EEM 8.4 SP4 as well as EEM 12.5. Spectrum 9.4 supports all the features of EEM 12.5.