Hello @Ccomm and welcome to the community.
Your Danelectro 59x has this spec:
Scale length: 25″
Fretboard Radius: 14″
Nut: 1.65″
I am unsure on your Squier as you don’t name the model / type. Is it a short-scale Strat with only 20 frets? If yes, its spec is:
Scale Length: 24"
Fretboard Radius: 9.5"
Nut Width: 1.61"
The Vintera 60s Jaguar has this spec:
Scale length: 24"
Fretboard radius: 7.25"
Nut width: 1.65"
Radius is an indicator of how ‘flat’ the fretboard is. Just thinking of electric guitars now, flatter is considered desirable for string bending and fast ‘shredding’. More curved is considered desirable for chords, especially barre chords. See my post here: Fret frustration! - #13 by Richard_close2u
This is possibly why you struggle with barre chords on the Danelectro - 16" is very flat in comparison to many guitars. Of course, those are not hard and fast rules and many people play all styles and all things on all guitars. The Vintera has the most curved radius, matching the vintage spec it is based upon. Unless you intend only playing loads of lead guitar bends of one, one-and-a-half or two tones and lots of sweep arpeggios and shred - and you never intend playing chords - then the difference might be marginal and not effect you at all.
The scale length of the Vintera 60s Jaguar is the same as your Squier so should be familiar. I do not think the longer scale length of the Danelectro is why you find some things easier on it. All are still a shorter scale length than a Fender Stratocaster or Telecaster etc.
You mention string spacing and that is where the measurements for nut width are important. The nut width is an indicator of the gap between strings. The Jaguar nut width - matches your Danelectro which you say is easier for you in terms of open chords (D minor you mention).
I think for barre chords you will find the Jaguar easier and better than the Danelectro. For open chords it should match the Danelectro and be more comfortable than the Squier due to the widths. For lead guitar play, you may find that the 7.5" radius does cause issues if you try to do David Gilmour style two-tone bends.
