I compared both specifications through gsmarena,After that Blackberry mobile is cheapest and quality phone.If you are interested to buying Blackberry mobile model,go to E-bay and get a locked phone.Because cost of the locked phone is cheaper than unlocked one.I bought my new phone by the same way.I never had any problem.After getting your phone,try to unlock your mobile phone using unBBlock.com Through the network unlocking you will be able to swap your sim card when you need.I hope my post is very useful to choose your phone.