Best use of TFSA?

I'd like to start investing my savings but I have enough to max out my RRSP, TFSA and FHSA. Should I put long-term investments in my TFSA and then the rest I have (after 6mo emergency fund) into shorter-term in an unreg account (e.g. additional house savings, hoping to buy in the next 5-10 years so I will do a balanced investment like XBAL) Or the opposite? The plan would be to also slowly transfer from this unreg account to FHSA as room becomes available.

Thanks!