How strong were the Palestinian groups in the Gaza Strip as of 2019?

How strong were the Palestinian groups in the Gaza Strip? How strong was Hamas and Palestinian Islamic Jihad? Here is a strictly NON-POLITICAL presentation of the groups that currently constitute the largest forces in the Gaza Strip. Note that this was before the last Hamas-Israel war, so today this information should be viewed in that context.

Sources: Enab Baladi, SIPRI, wikipedia, The Guardian, The Times of Israel, Carnegie Endowment for International Peace, Combating Terrorism Center at West Point, Globalsecurity.org, The Jerusalem Post, Al Jazeerah, Telegraph, Associated Press, The Washington Institute for Near East Policy.