Hi everyone!

I am looking for the best wallet, online or iOS-friendly, for numerous transactions.
By now, I am using Freebitco.in which is not really a wallet... but I didn’t find a wallet with lower fees.
As I am writing, I pay 1772 Satoshi for slow transaction (~6hours) and 7532 Satoshi for fast transaction (~15 minutes).
Do you know of a more balanced wallet for transactions ?
Can you write your transaction fees at the very moment you answer?
Thank for sharing your experience !