Tabular numerals are very useful in certain cases, but I find even more useful the old-style numerals.
By default, I always use old-style numerals, because they are much easier to read, especially for big numbers, for the same reason why the lowercase letters are easier to read, by having ascenders and descenders that break the uniformity of the characters.
I use lining numerals only in the same places where I would use uppercase letters, e.g. in titles or when a sentence begins with a number.
A font of antiquated faſhion doth boaſt moſt excellent and ſubſtantious qualities, yet prithee, what of olde ſtyle figures doſt thou deem hath benefit that I, in mine own diſcretion, might chooſeth?
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By default, I always use old-style numerals, because they are much easier to read, especially for big numbers, for the same reason why the lowercase letters are easier to read, by having ascenders and descenders that break the uniformity of the characters.
I use lining numerals only in the same places where I would use uppercase letters, e.g. in titles or when a sentence begins with a number.