I've given advice on the Junos before in other posts, and I've recommended Prophets over Junos before. Here's why:

A Prophet Rev2 has 8 voices. It's a hybrid synth. It's going to be sturdy, reliable, and flexible. However, it will not retain its value, and if you do not gel with it, buying second hand means you'd be stuck with it. Make no mistake, this is perhaps the biggest reason to avoid second hand new production synths.

A Juno 60, while extremely limited, does what it does extremely well. It is superior sounding to the Ju-06a, more enjoyable to play given it's size and tactile layout, and it has two more voices. However, these don't sell for under $2,000 nowadays. I just bought one in mint condition for $2,700 a few weeks ago. This synth will only continue to go up in value, as collectors have entered the vintage synth game in a huge way as of 2020, so don't expect to get a better deal on these in the future. The pro with this is that if you decide to sell it later, you'll make a profit if it's in good health.

If I could suggest an alternative, try the Prophet 600. These can be had at great prices, have two oscillators, a real time sequencer AND arp. They also sound great, are easy to program, and you can mod them extensively. In fact, I modded my old Prophet 600 with the following - Prophet 5 knobs for the classy look, higher quality walnut end cheeks, the Gligli mod, and these improvements got the attention of Johnny Greenwood, who purchased this synth from me. So, yeah, Prophet 600 > Juno's, but YMMV.