When do you intend to buy?
I'm hoping to buy probably early next year and i've worked out that the LISA isn't really worth it for me.
Example worked as of end of March 2018:
HTB bonus LISA bonus
£1,650 £1,000
If we then add another year of bonus payments, this would be the bonus at the end of March 2019:
HTB bonus LISA bonus
£2,250 £2,000
It's only if i hadn't bought by March 2020, that the LISA bonus starts to become better:
HTB bonus LISA bonus
£2,850 £3,000
But again, all that for the sake of £150, and that almost approaches the max bonus paid about by the HTB ISA.
Also worth mentioning that the LISA interest rates that i've come across are awful, i don't know how long Halifax intends to keep my HTB ISA at 3.5% for, but the interest earned is likely to narrow that 3rd year gap.
So the ultimate question is really when do you intend to buy.