Ideco: where to go?

Hello

So, I recently started to understand I should open an Ideco account. But I am wondering where I should open it. I got that I should aim for one with minimum management fees and with cheap funds available, but I am not sure what would be the best. I see 3 possibilities for me:
– SBI Securities
– Rakuten Securities
– Daiwa Securities (through my local bank)

I have an SBI bank account, but not a Rakuten bank. In both cases, I would need to manually fill the accounts/transfer money to them to fund the Ideco account (which implies transfer fees I guess).

Any suggestions of what would be the best?

My understanding is that I will be limited to 12000 JPY per month, if that matters in the choice.

by ArtisticPool1