I currently own, and have gigged a GK MB800, MarkBass F1, and had a GK Legacy 800 for a few weeks. I had a Quilter BB800 for a few gigs at the end of last year as well, and earlier last year i had a TCE BH800. I also have a GK MB200 but i dont consider that for gigs. Out of all of them them its the Fender that is now doing it for me. I wouldn't say its the most inspiring head, its quite warm and id say does lack character compared to the GK heads, but its the one that give me consistently less to worry about at gigs.
It just sits there with most of the knobs at 12 o'clock and gets me heard. I like the tone so much ive stopped using my Helix(s). Just bass, amp cab. I do have a small compressor coming as i do feel the upper notes need a bit more punch to them sometimes, but thats probably something i wont use a lot.