I've had a couple of different types of work boots in the past, elastic sided Blundstones, Steel Blue lace ups.
When I brought a pair of Rossi Endura Claret elastic sided boots they were the most comfy I'd had (much better fit for me compared to the Blundstones anyway). As someone mentioned I found they tend to wear a hole in the heel of the socks more than lace ups, however the Dunlop Volleys I brought after them wore a hole in the heel of the shoe instead lol.
I had to run / walk close to 15km in them (Rossis) once to go pick my car up (which was being repaired and my bike tyre got a puncture in it 2km into the trip so I dumped the bike in the bush) to go get the kids from school. The shoes weren't ideal but the feet didn't end up in blisters and nothing like that considering I wasn't used to doing so much walking / running at once. They were well worn in by that stage too.
I almost went for the old faithful (slip on Rossi) again this time around, the Hi Tec Altitude lace ups fit nicely and felt comfy but I couldn't bring myself to pay $250 at a local store as they didn't look as durable as some others. The Rossi Raptor hiking style lace up boots were on sale (clearance I reckon). So I ended up going with those and I"m very happy with the choice so far.
I can still see myself buying a pair of elastic sided ones as a 2nd pair down the track though.
I am finding with hook rings near the top rather than d rings all the way up the new boots aren't that hard to get out of compared to sneakers / skate shoes or whatever.
So I agree with the general consensus, one of each is probably a good thing