How did you connect your data centre to Cloud Data Centre? Did you opt for VPN or leased line?

VPn is preferred  in you have less data  with a minimal or standard  volumes .- cheaper option 

if you required for fast cache  (file /NAS )its better to  opt for a lease line with lower bandwidth which will be expensive 

we have been using VPn since 3 years  and it works smooth n less latency