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For DIY projects (as a beginner), is it recommended to purchase laminate floor with the attached underlayment or without it? Any specific pros and cons I should know about?
Thanks!
Go with what the brand recommends or the flooring instructions specify.
Compression of additional underlayment, under normal use dynamic loads (walking etc..), may cause unnecessary movement and flexing at the seams / joints and thus possibly lead to premature failure.
This can result failure of the moisture seal at the seams, or mechanical locking, or cracking of the tile.
For planks with attached underlayment, it is not acceptable to install additional underlayment prior to flooring installation.
Pergo Xtra documentation
The instructions will be painfully clear about this. You really should read them thoroughly to achieve a satisfactory outcome and not void your warranty.