One of my regular opponents plays both, so I will try to explain them some.
Hoffman is focused on synergy; his crew defines his abilities, and he makes them better at theirs. He can be surprisingly nimble thanks to Drawn to Metal pulling him along behind his constructs, and Assimilate tricks can make him astonishingly difficult to kill until his constructs - who are usually loaded with Armor - are cleared from the table. He tends to lead from the middle or near-back of his crew in a sort of turtle so he can use his tricks - such as Machine Puppet - to handle problems as they come up. The Watcher(s) and the Hunter, if included, may range out a bit, though. Constructs are his thing and, while some non-constructs may occasionally come in handy, the core of his crews will most probably revolve around them. He can hire a few of the Arcanist constructs, though, so he does not lack options.
Ramos, on the other hand, tends to lead from the extreme back; many Ramos players never bother to move him much from the deployment area, largely due to a low Df, relatively low speed, and generally having better things to do with his AP than walk around. Mostly, he sits back and summons Steampunk Arachnids and Electrical Creations - the latter being more of a floating bomb - to wear his opponents down. Electrical Fire, his ranged blast, can be a surprisingly effective deterrent for keeping enemies away while he continues his summoning. His crews tend to depend less on Ramos directly save maybe the little spiders, so there may not be as much of a driving need to primarily use constructs if another model would be more effective for the situation.
Avatar Ramos bears mentioning, as well. It changes his style from the back-line summoner and blaster into a hopping melee beatstick that largely dashes around the table at an absurd speed and bludgeons enemies into insensibility. His summoning remains, and in fact expands to cover slightly larger constructs such as the Large Steampunk Arachnid.
Overall, I'd recommend Hoffman if you want to be more focused on enhancing and controlling your crew, or Ramos if you want to be more of a back-line caster and summoner with the capacity to manifest, jump in, and do some damage up close.