Triangle Magellan Cello vs Signature Delta


anybody had a chance to compare the two? Is the extra expense worth it? Listening mostly to 70s/80s rock/pop and acoustic on vinyl. 

I wonder if the tweeter upgrade in particular will result in less fatiguing sound, and which one is more exciting for rock music. A review stated the Magellan series is more tame...

Amp is currently a BAT VK55, thinking changing that to a LTA ZOTL 40 (maybe mono bridged)...

Advice and opinion welcome :)