From my understanding, Swedish language is harder/more complex to pronounce words in general compared to English. I stutter a lot more in Spanish compared to English because it has a bit more pronunciations you need to combine for words, that and I've grown up around people that are used to speaking fast in Spanish so I mentally always have to keep up with their fast pace, causing me to stutter even more. All that, and I've already adjusted myself on how to force the words I want to speak in English, not so much in Spanich.