Either way, if your income is insufficient, you will need a joint sponsor for the affidavit of support. The issue is whether your wife is likely to become a public charge, and not whether you are a public charge. If you permanent live off of needs based, public benefits, you are a public charge.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.
Whatever the choice, it would not make your question into immigration one.
The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter,not should it be viewed as establishing an attorney client relationship of any kind.