Shockboard (or something exactly like it) is still the way to go on the front imo. Downtube guards just aren’t any good and this trend for arch mounted guards just seems daft to me, crown mount avoids all the mud trap issues and is better at catching watery spray too. SKS’s range is pretty confusing though I think, I have some shockboards but I’ve no clue which of their guards I’d buy today, shockblade maybe. Grand DAD for the fatbike maybe.
Rear, only recommendation I have is the Topeak Defender, but it’s a seatpost mount. Certainly the best I’ve tried since crudcatchers went shit. Very adjustable, but still going to have issue with suspension. So not sure if that’s any use to you.