Go with the larger one IMHO, you adult will need an upgrade to a 20G L eventually and that allows you to move the UTH to the new enclosure. Look around for guides on how to affix a UTH without using the included intended-to-be-permanent adhesive.
UTH don't change ambients much so if the room is set at 72F you may need to consider a CHE and/or as well. 75F is as low as they can safely go. 78-79F is more ideal.
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