Since Diurnal Sect adds a regen effect to Aspected spells...

[Nihility]

5% spell speed would increase your spell speed stat by 5% which would increase your HoT potency a little and make your spell speed on the stat sheet a little better looking
but 5% attack speed reduces all your cast times/gcd by 5% which is simply a far stronger effect

using the new 3% attack speed fey wind is a little stronger than the old 30% versions as a reference
should mean 5% attack speed is 10+ times better than 5% spell speed would be

[VitalSuit]

5% spell speed would increase your spell speed stat by 5% which would increase your HoT potency a little and make your spell speed on the stat sheet a little better looking
but 5% attack speed reduces all your cast times/gcd by 5% which is simply a far stronger effect

using the new 3% attack speed fey wind is a little stronger than the old 30% versions as a reference
should mean 5% attack speed is 10+ times better than 5% spell speed would be

Problem is it takes hundreds of points in SkS/SpS for it to make a difference. 5% of your SpS at like 600 SpS would only be 30 SpS, that's literally nothing and would make a huge change of nothing to your HoTs

[Nihility]

Problem is it takes hundreds of points in SkS/SpS for it to make a difference. 5% of your SpS at like 600 SpS would only be 30 SpS, that's literally nothing and would make a huge change of nothing to your HoTs

not sure how that's different to what i wrote to begin with.
I originally wrote it as "5% attack speed is 1000% better than 5% spell speed" but figured it would just be taken as hyperbole instead of literally

It wouldn't be literally nothing either. When Hots are ticking over 1000 a 5% spell speed buff would probably result in a boost around 5-20 per tick which while basically is nothing it does exist and maybe see 1 or 2 hundredths of a second faster cast on the spreadsheet which would technically look better but carry no actual meaning