Most of the "newer" CMOS logic made in the last 10 to 15 years have clearly defined hi-lo input levels and excellent stability until they latch after exceeding each level. They are a real step up from the early TTL and early CMOS which had very poor input pin performance, and the modern chips generally have more complex input circuitry, clearly defined LO-HI levels and cleaner faster switching.
All "newer" CMOS gates are fine for making RC inverter oscillators (as the OP asked) and I have used CMOS gates to add oscillators to circuits for many years, and that includes HC ACT etc, although I do buy only brand name CMOS and not weird Chinese knock-offs.