Hard to say, as there’s a number of things both DAW’s can do, offering different methods also.
If you’re looking at other DAWs, what is it that made you curious?
For singer songwriter, for me the main advantages would be variaudio for vocals (tuning system) and the chord track.
Using the chord track you can create music with the chord progressions listed above the timeline which gives your structure and helps plan out taking songs in different directions thanks to the additional chord selection features.
But furthermore, once you have that song structure in place you can then use Variaudio to not only correct vocal tunings, but individual notes are colour coded so that you can see where you’ve sang in tune, and where you’ve been out.
The beauty of this, is that you can move those notes and up and down the scale and try out new vocal phrasing which you may not have naturally thought of. When you have a correction or phrasing that sounds good, you can then play that back as a guide track into your headphones and record an ‘actual’ vocal take based on it.
There’s also harmony generators, so you can take a single vocal line and harmonise it out - again, you can adjust these with variaudio and use them as a guide track for new (more natural) vocal takes.
It’s like having a second person with you to objectively review your performance really. Short video that touches on how it works-
Outside of that, I can’t think of anything else that has affected the actual end result of my creativity to any great degree. The plugins are great, it mixes great, has a ton of features - but really, compared to Cakewalk it’s all very subjective and dependant on how deep you dig.
Groove Agent SE also has a very nice sounding range of drum presets and HALion Sonic SE is reasonable for bread and butter sounds - so perhaps they’re an upgrade on Cakewalk? I really don’t know.
I’d be more inclined to say that £500 is hard justified because of the sheer bang for buck Cakewalk delivers, you’re paying £200 more for features you may not even use too. So, look at the Artist version of Cubase than the Pro version if you’re interested, you can always move to Pro later in a sale.