I read about 10 chapters of Pluto... couldn't get into it. The pacing got me again, lol. Just too slow for my liking. If it had an anime I'd watch that. I'll probably pick it up again when I have the spare time. Have you read it?
Tried reading Monster manga and it wasn't working out for me. Too many panels dedicated to unimportant stuff imo. Haven't read 20thCB either but people hail that more than Monster. It's only about 330 chapters. I'll probably give it a read sometime