PG1995,
as mentioned before, the single opamp circuit allows for a complex pole pair - which means (as you have mentioned) that all known responses (Butterworth, Chebyshev,...) are possible.
Nobody would use the single pole cascade as shown in Fig. 2. because it has no advantages.
Remark: The 2nd order circuit is rather sensitive to opamp gain variations (a known disadvantage of this Sallen-Key topology). Thus, I recommend to use a gain of unity or a gain of two with two identical resistors.
Design formulas are available for both alternatives.