I do not have direct experience with the PEG but I get how it works. It is a pretty full featured dual AD EG with clock div/mult on the trigger and quite a few other tricks. IMHO it is not exactly as straight forward and many other AD EGs out there.
The Intellijel Dual ADSR is also really nice, if you are looking for an ADSR, but there is no CV control on the stages.
I think first you need to ask yourself do you want an AD or an ADSR. Personally I’ve found I rarely need an ADSR and for most envelope duties an AD is more than adequate. But I do often find myself wanting CV control over the attack/decay or both at the same time. Also an EOC or EOA is a really nice bonus.
So, the obvious answer, MATHS. It’s awesome and recommended all the time for good reason. Also I really love the Intellijel Quadra, the expander gives you a ton of options. If you want a really versatile and robust single EG the SSF/WMD Mini-Slew is a beast.
Sliders really make more sense for a 4 stage EG but I do not think it matters for 2 stage. If you really want sliders in a 2 stage check out Befaco Rampage.