A Solo Superhero Sandbox Scenario?

Switching gears from constant sci-fi and M-Space stuff, lately I've been in the mood for superhero gaming. I blame binge watching Flash season 3 and My Hero Academia with the lady friend. But I don't really want to cancel my M-Space game. So I've decided to try my hand at solo gaming again and do a superhero solo game.

Right now, I'm waffling between using ICONS, a simple hero game reminiscent of FATE done by the Mutants and Masterminds guy, and Guardians, an OSR clone done more in the style of super heroes rather than fantasy. I've played ICONS and liked it, but I also like trying new things and am looking at Guardians. I am looking to keep it simple for ease of solo play, so anything in that style can fit.

I'm going to be taking my notes from a superhero campaign I ran a couple of years ago called Magic City Defenders. In it, I had the players as Miami's first premiere superhero group. There's a map of the different sections of Miami (Overtown, Brickell, Wynwood, etc) that I had planned to use as a sort of patrolling 'hexcrawl'. Basically, the players would patrol a different borough and I would roll a random crime encounter table. The difference between this and fantasy games though is that something would always happen. It was just a matter of how important it was. More often then not, it would be simple stuff like muggings or car jacking, but every so often, there would be a bigger supervillain event that the players would have to contend with. The map of the neighborhoods is below for anyone interested

So with this, I plan on taking those notes and applying them to this superhero solo game. Luckily, ICONS has a fairly robust adventure generator that I can use, even if I use Guardians or some other game. In addition, I have a great catalog of villains from all kinds of systems, from HERO and M&M to ICONS and Savage Worlds. I think I'll have enough to go off of for a good solo campaign. I think I'll start with a premade adventure at first, to get my sea legs again with solo gaming. After that, I'll do more of my own adventuring.

My biggest enemy is time, or lack thereof. With summer here and working at a restaurant next to a movie theater, there is no slow season. People flock to our kitchen while on their way to the next summer blockbuster. And this week is the premier of Spider Man so... it will be a difficult time to say the least. That's partially why my Mythras solo adventure write had been put on hold (the other being bed bugs). I'll have to finish that sooner rather than later.

I think I'll decide on which RPG to use by tonight, though I'm always down to try new games out there. I'm leaning towards ICONS since I've played it before, but Guardians looks like a lot of fun. And I am more familiar with d20 systems. Also I'll post my hero at some point, before I get to the adventure.