when choosing a bitcoin wallet, one of the things you need to consider is whether the wallet is even legit or not. using lists such as list of wallets on bitcoin.org is a good method of doing that. also doing some research to see how popular that wallet is. for instance a wallet that thousands of people use is much safer than the one that only 10 people use because the first one is used more and the bugs are already found. but the second may still have bugs that aren't found because of lack of usage.

with that said i have never even heard of BitJar! searching google didn't give me any satisfying results either. but Electrum is a trusted and old wallet that has been used by a lot of users for years now. so i guess the choice is obvious.