CitizenM Tower Bridge vs Novotel London Bridge

Hello,

I am going to be on a business trip (5 days) during the last week of July. I have two options - Citizen M tower bridge vs Novotel London Bridge. Citizen M is slightly cheaper (40 GBP per night)

I have read the reviews and both seem good, however I am worried about the citizen M room sizes, I suspect it to be claustrophobic since I will be staying 5 nights.

Any suggestions would be highly appreciated.