I'm going to assume your money is locked in, until you purchase a property or eventually withdraw it as a pension? i.e. with the HTB ISA, you could just withdraw your funds to buy a car for example, but you'd lose the hidden bonus. I'm not sure how that would work with a LISA if they're already paying you the bonus directly.
Mine and my partners plans have changed, we almost bought a house last year but pulled out after a number of problems surfaced. She's now decided to go back to uni, which obviously means any mortgage calculation would be based solely on my salary. Ergo we've decided to stay put renting until she qualifies - unless of course Brexit causes house prices to tumble.
We've both currently got the HTB ISA's that we've had since launch, and they have 9k ea with the hidden bonus of 2.25k ea, but the big kicker is that these can only be used on a property of upto 250k. That was our original upper limit and we've struggled to find something that we like in that price range. Obviously when she graduates, her salary combined with mine means we could afford significantly more than the 250k, so doesn't really make sense to stick with the HTB ISA anymore. Also with her course spanning potentially 4 financial years (technically 3, but April to June would be the start of a new financial year), we'd be able to build up a bigger lump sum from the bonus.
I think i've pretty much convinced myself that this is the better route to take, i just don't like giving up that flexibility that if Brexit did cause a big drop in prices and we found a property that we'd like, we'd end up losing out on the HTB bonus that we've accrued so far.