I consider mini Bics to be more rugged. They are simple yet over-engineered and remarkably reliable. I have not had a leaking problem with mini Bics. Anyway, you can tell how much gas is in a mini Bic by looking at the white bottom and holding the Bic horizontally. Better yet, get a mini Bic with a case that is white, yellow or orange. Also, a mini Bic has no exposed wick, which may be a weak link on the peanut lighter.

Unfortunately, mini-Bics are not waterproof, like peanut lighters are (or should be). That's typically not an issue, but one should be aware of it just in case your backpack falls in a river. You need to let the mini-Bic dry before you can light it. It doesn't take long to air out. I just tried it. My mini Bic was able to light in about 2 minutes after being dunked in water. I heard that if you take the childproof lock off, then the mini Bic works while wet, but I have not personally tried this.

Regarding the peanut lighters from DX, I have had no leaking problems because I swapped out the O-rings with better ones purchased off the Internet. Overall, however, the peanut lighters from DX are more finicky than mini-Bics. I don't own any peanut lighters from Countycom, and I don't plan to buy any.