Transferring to M1 from E-Trade. Liquidate account or transfer?

I have a taxable brokerage account and a Roth IRA in e-trade. Both accounts are down significantly overall and I am thinking of transferring to m1.

I see m1 has recently introduced online account transfer portal (no more emailing statements), which is great, but I would incur transfer out fees from e-trade.

I'm debating whether to just sell everything in both accounts inside of e-trade and transfer the cash to m1, or do the more traditional transfer.

I don't care so much about transaction history (I intend I'm keeping however my pie is set up in m1 for long-term investing), I know I will be resetting my start date with regard to Capital gains, but those two things aside, are there any pros or cons to this approach versus a full account transfer? Thanks!