The FT-857 isn't the best radio from an operator interface. It's not bad as a mobile or portable radio but it's definitely a compromise. I fully intend someday to get a decent base HF radio with a screen I can see and bigger buttons when money is there for it.
As far as brand, it's really a personal preference. Go over to HRO and spin dials. You might find the FT-991 is fine, you might like something else in person. I'm not exclusive brand-wise. I've had Yaesu, Kenwood, Vertex, Motorola, Icom, Alinco and Connect Systems. There's benefits to staying within a system, programming cables, interfaces, etc. But get the right tool for the job. I generally recommend to people the TM-V71 over the Yaesu options, it's IMO the best candidate analog dual band, dual VFO mobile radio at the moment.
With HF radios you start to build even more stuff with respect to antennas such as tuners. I have an Icom AH-4 tuner (which is awesome) I used with an IC-7000 (which I should not have sold) with a hacked box that works with some Yaesu radios, but it's dodgy and so that makes a real Icom HF radio more attractive.
In this case Yaesu's tuner, the FC-40, isn't one the better options and that makes Yaesu radios to me less attractive. It's got a limited impedance range and requires a 7-conductor cable with a DIN plug. Just not the most robust or simple to deal with.
I have an ATAS-120 that works well for a screwdriver. It requires just the coax and handles communication over that. I don't care much for screwdriver antennas generally and that it is seamless functionally makes it to me OK. I wouldn't bother otherwise if interfacing wasn't so clean.