The SDS1202X is an older model than the SDS1202X-E, and the internal architecture is a bit older so it doesn't have quite the same performance as the SDS1202X-E models, but the SDS1202X+ includes a logic analyzer and wavegen.
While the older X and X+ models are decent scopes with perfectly reasonable performance, the X-E series scopes offer more customization and flexibility and thanks to the their different CPU, are a fair bit faster in terms of usability and if you spring for the 4 channel model can be configured with a wave gen or logic analyzer.
An early version also was SDS1002X-S, they had the internal AWG/wave gen but not the MSO front panel connector.
It's a good sound basic DSO with a nice 8" display and 50 ohm inputs but Decode is an option at additional cost.
If the MSO, 8" display and 50 ohm inputs aren't required the 1202X-E is better buying and more capable mainly due to the fast processor it has.
With the savings instead of buying the SDS1202X-S, put those $ saved towards a standalone AWG would be a better choice particularly for the higher amplitude outputs they provide.
@Cursed
For just a few $ more the SDS1104X-E is a far more capable scope, even more than the cheaper SDS1202X-E if you can overlook the higher BW.
While I haven't got any SDS1*02X left now I sold a few and know them fairly well if there's any further you need to know about them.