I moved to NOVA after 30 years in MD, mostly in the northern PG County area. Apart from cheaper housing other things I liked about being in MD: I was extremely close to downtown DC by Metro or driving, the huge numbers of parks and bike trails, the more country feel (compared to NOVA), and being close to Baltimore, Annapolis, the Bay, and a lot of other places. I still go to MD all the time.
Are you renting or buying? Buying is outrageously expensive in close-in VA. Buying is more affordable in PG County, MD and most of PG County is a decent place to live despite its reputation. The commuter rail service in MD is better than VA (faster). I know people who live in West Virginia and take the MARC rail to downtown DC for work.
But taxes (income, property, sales, gas) are lower in VA. Some other costs are also lower, like electricity and water utilities and insurance (my car insurance is half what it was in MD). Traffic is bad in MD and horrible in VA.
Read up on the MD gun laws, they are ugly, but many in MD manage to put together nice collections and go shooting despite the crazy laws.
There is an excellent MD shooter forum at mdshooters,com.