just because a kickstarter says it's ready to release - doesn't mean you won't have to wait another 18 months.
The ono is a fun toy for smartphone users who haven't yet realised how long a 3d print takes :-)
But it's far from being a serious 3d printer.

The form2 is quite good. And I think you can actually buy better trays for the form 2 - certainly seen posts from people who have upgraded them.
And as has been said, it can use non-formlabs resins.

The b9 creator gets good reviews and is definitely modifiable.
Has higher resolution than the form 2, prints faster than the form 2 (this is not hard, 99% of the form two layer print is mechanical lifts and wipes, just looks sooo slow when you watch one in action).
the b9 does cost more than the form2 - but looks like you'll save money on resin in the long term and get better prints into the bargain.
scroll down to the comparison table: https://www.b9c.com/