What IP Boost To Buy Good

i want more IP what IP boost i need to buy i see in shop have 1. 30 days ip boost ( increase your IP/XP for 30 days/wins ) 3490 RP and 2. 50 win IP boost (increase your IP/XP for 50 days/win) 2560 RP . can you tell me what boost i buy good for get more IP