There are plusses and minuses to each. Keep in mind, a shaper can only run around 10K RPM. That's about half the speed of a router, which makes sense since shaper cutters are by definition larger diameter. Back when I put together my current router table, I researched this as an option. From what I read on the various forums, about half the people who had gone the shaper route said no problem and the other half had added a router table back into their shop in addition to the shaper to use smaller bits. You may also have to fabricate some sort of rings for various size router bits.
My solution was to use a less expensive lift. I scored a refurb 3HP Hitachi router for $90 and added a woodpecker plunge lift. Total cost less than either the lifts or routers discussed above. Not as nice as these lifts, but pretty darn good for less than half the price.