A DAW is like a Workstation in that you build up what you want from scratch, (Whatever you want you can do, it’s only limited by your imagination)
An Arranger is press a button and play, as everything is done for you so is dead easy to make music.
Now while some will say you can do on an arranger what you can do on a Workstation, (And vice versa) it’s actually a load of cobblers, as while there are similarities, they are completely different instruments designed for different jobs.
Another error arranger players make when they go for a DAW, is that they go for one of the top versions thinking it will do everything they want, (Which it will if you know how to do it and have the time) however, most arranger players will probably never use 909% of what’s available, so they would be better off buying the entry level versions (All allow an easy upgrade path) as it will do everything they need without confusing them.
Regarding Midi Controllers, then unless it is a cheapo special, you will find templates available (Most DAWs have them built in) that you can use to automatically set it up for whichever DAW you use, (Which if you are not technical is ideal) so you don’t have to worry about it.
A style (Arranger) engine that could be added to a Workstation as an option would be ideal; unfortunately, they are 2 different departments which never meet, so I wouldn’t hold your breath.
As to a recommendation, then just like there is no one size to fit all Arranger or Workstation, the same applies to DAWs, so it’s a matter of downloading the trial versions to see which suits you best and going on from there.
As to arrangers, then if you want easy but with limited control, then Yamaha is the way to go, however if you want to get more down and dirty, then Korg is the way to go, (To be honest the Korg PA4x is probably everything an arranger player will ever need to get down and dirty, particularly as it has both an Easy and Pro mode) with the rest being in the middle.
In the final analysis though, no matter what you buy, if you haven’t got the talent then you’re never going to move outside the box. (No matter what magic features you keyboard and/or DAW has)
Hopefully the above has given you something to ponder over, before you jump.

Happy pondering

Bill