"Nowadays" refers to the present while "in our days" is past tense and isn't something a native speaker would say often.
Hope that helps! (:
2016年2月11日
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"today," "presently," "currently" can be considered more "academic". But it really doesn't matter; "nowadays" can be used. It just one word which provides transition/context to the main statement.
I believe the word "today" is used more often.