I have both and when I jog I would much rather be outside jogging
when the sun comes up. I tend to have a hard time doing it if I
don't do it right when I get out of bed. Also saves on water don't have
to shower in the morning and than again after I work out.
As for the bike I love mine I have a stationary airidine, I watch the cooking
chanel and think to myself I won't feel guilty if I just ride 10 mins more if I cook what they are making.
For some reason I rarely will use the treadmill.
When first starting out the bike will help your buns, my thoughts are just as
much as a treadmill will. The buns need leg lifts and squats this is what works for me. They say after sticking with something for three weeks it
becomes a habit. After starting and feeling better you won't want to quit.
Happy working out