Katy has 5 #1 songs from Teenage Dream.
Taylor has 3 consecutive albums (Speak Now, Red, 1989) sold over 1M+ in their debut week.
Which one is more impressive?

5 #1s from one album

Three consecutive 1 mil

3 consecutive 1m+ opening weeks, obviously!

Albums > Singles

3 1M+ openings. But both are amazing achievements that should be rightfully respected!

Both.

They're both impressive. But 5 #1's from one album is insane

Both are very impressive accomplishments in this era of pop music, but having 5 #1's from a single album is incredible. So that.

3 consecutive 1M+ opening weeks.

Both are very impressive but if I had to choose I'd pick 5 #1 singles because singles always represent you and you are remembered for them.

Both super impressive achievements, but I’ll go with the singles

3 1M+ debut week sales.

Three consecutive 1M-selling albums is just insane

3 1 million first weeks

The other has been done multiple times thereby less impressive

It's only been done twice, MJ & Katy.

Exactly, multiple times

Three one million opening weeks. It shows career consistency over a number of years, while five #1 singles from one album merely shows that a person had one enormously successful album campaign.

5 #1s... that's pretty damn difficult