I used a B3 for a while, and found it to be versatile, though if you want to use more than 3 effects at once, it could be a bit limiting. I got an MS60B from someone on here, a great wee pedal, but very limited regarding switching effects during songs. I now use the Line6 POD HD500x, which gives me all the flexibility of an effects floor board as well as all the amp sims. Sounds great too.
Modern multi-FX are so much better than their forebears, though a good number of people insist on individual effects. Must admit that I was something of an analogue snob while I was playing guitar for gigs & rehearsals (valve amp & analogue pedals), but used a POD for recording ideas and practising at home. A good multi-FX can allow you to experiment with effects that you'd either not find, or would be too expensive to buy just to experiment with. IMO, you can use the multi-FX to find sounds that you like, and then you can build an analogue rig from there if that's still a priority.
When you start to look at rigs like the Axe FX, Kemper & Helix, you realise that multi's have come such a long wayin a relatively short period.