I know spin bikes are all the craze now thanks to peleton aggressive marketing but before you invest in one, I recommend you test how your body reacts to them.
This is now the second wave of spin bikes, when the first wave started a couple of decades ago, people soon discovered that it didn't exactly give them the body shape they wanted. Some will refine their body nicely, some however will get bigger legs.
Unless you know how you respond to spinning, rent one for a month and see how your jeans feel.
Rowing actually burns double the calories of spinning, but requires time to get the technique right. Most people I see at the gym get the sequence wrong or jammed (it should be leg-torso-arms last) or don't use the torso at all, curl up on the way back, they are moving up and down and pulling on a rope, but not rowing.
You can't row and Facebook or Netflix at the same time. When you do rowing, you get into the zone, you focus on the sequence, on what you are doing, it actually does great things for the mind. For me it is meditation on steroid.
I think it is the only whole body workout, since bike will only do legs, running, legs and some core, but no arms or back, cross trainer, the workout is not evenly distributed and it is so low impact can it will bring zero muscle strength. Okay-is for cardio I guess, but 15 powerful burpees will do more for your heart and do great for your bones which on the other hand are untouched by crosstrainer.
So in the end, the most important question as a PP already asked is what is your aim.
Have a look at some of his videos here, and maybe you will reconsider the rowing. www.youtube.com/channel/UC6k6vvs0mc25M4Ximk6S0xg