The might offer a choice but I really don't know, I have my servers in Schuberg Philis, but my clients have servers in EasyNet.
To be honest though, in Europe, datacentres are mainly carrier neutral and all the datacentres that LeaseWeb use are located in Amsterdam and use the same network, so there isnt really a difference in speeds, pings or reliability.
It possibly costs more to choose, I think EasyNet are currently where they are putting most new "low cost" servers, but it used to be SBP, maybe its just a case of wherever has spare capacity.
Email them and find out though, and post your findings here when you have done for future reference.
█Xcellweb.net - Quality Web Solutions That Work!
█ Web Hosting | Web Servers | Shoutcast | Domain Names
█ Providing High Quality Web Solutions Since July 2002!
█ 5sterling.com & 9dollars.us - No-frills budget web hosting, VPS, shoutcast and domain names!
Considering that Redbus just raised their prices with 50%, I dont think they'll put your server there without an extra fee. The costs for the rackspace at Redbus alone is more than the total costs for a budget server at leaseweb (@ easynet DC)