Varifocals vary........geddit?...Oh please yourselves. I've used them for the last ten years. But.....and a big but...they are not the same from wherever you get them. The best I've had have been from Vision Express because they seem to use a lens with the biggest area devoted to close up. The worst I've had was from a close competitor and which were never "right" from the day bought, and close up stuff was distorted. Tried to complain, but as I had had the eye test elsewhere, they blamed the optician, whilst the optician blamed the manufacturer. There's a lesson to be learned here.
Basically I think you get what you pay for.