which exercise bike is best?

white510

I am 49 and facing a knee revision on Tues. My first replacement was 14 yrs ago and I never was able to ride a bike after that. I have always been a huge walker but my Dr is very hopeful that this time I will get enough of a rotation that a bike will be extremely helpful to my therapy. I have never had one so was curious which is best, a stationary bike or a recumbent bike. I am not afraid of pain or working the muscles in this leg and would like to get one that will provide be a good workout. Any suggestions between the 2?