Depending on the bike, it might be easier or harder but either way I wouldn't worry about the 20 min journey. Give yourself extra 10 mins if you need to go slow.
When I used to bike, citymapper had the option for 'fast' and "slow" bike so you could work out the min-max time to allocate for the journey.
When I meant dependant on bike, city bike Vs racer bikes extra changes the dynamic of the ride. I always went for city bike as i need a bike rack and a basket.
Depending on the bike, it might be easier or harder but either way I wouldn't worry about the 20 min journey. Give yourself extra 10 mins if you need to go slow. When I used to bike, citymapper had the option for 'fast' and "slow" bike so you could work out the min-max time to allocate for the journey.
When I meant dependant on bike, city bike Vs racer bikes extra changes the dynamic of the ride. I always went for city bike as i need a bike rack and a basket.