My garden is reasonabley flat, but not as flat as a bowling green.
My hover mower was easy to use initially, but as the grass box
got heavier it got harder to push. The suction mechanism was not
as efficient as I liked it to be, I always ended up with a line
of cut grass on the side. I am wondering whether a wheeled type
is going to do a better job than the hover mower. Would it be
any easier to push along? Would it be more efficient in vacuuming
the grass?

The problem with any hover mower is that the very fact that it needs a down
draught to hover goes against the suction needed to pick up the cuttings.
This is overcome by using the down draught to blow the cutting up into the
box. Keeping the box vents clean along with the hover vents always improves
performance, but requires constant attention. Almost any wheeled machine
will pick up better, be it electric or IC powered, just go for the best
quality machine you can afford.

Mike