Well that all depends on your goals...
Each piece of equipment works different parts of the body. The rowing machine works primarily your pulling muscles (back, rear delts, and biceps) and legs while the stationary bike just works your legs. Now on one hand, the rowing machine may give you a better full body workout and help you to achieve muscular endurance in your upper body, but this is a physically demanding form of cardio as your upper body tens to exhaust before your heart does. For this reason, most people cannot use the rowing machine for the amount of time needed to truly get a good cardiovascular workout and burn the calories. Now, the stationary bike works primarily the legs and is more suitable for longer durations, but as stated before, it only works the legs.
My suggestion to you is to not buy either and spend the money on a gym membership and maybe a Personal Trainer. I'd be willing to be about 99.9% of all home gym equipment is used for about two weeks before it is used as a second table, work bench, or just lays around collecting dust. Most people want the convenience, but exercise is meant to be inconvenient and I gaurantee you workouts will be better and more consistent at a gym than in the security and privacy of your home. A gym will give you more access to more resources including stationary bikes and rowing machines. Now, maybe my opinion is a little bias as I am a Personal Trainer, but I've seen failed attempts time and time again with the people who try to be disciplined and perform their exercise at home. Hope this helps!
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