FTDNA has the best all around testing for genealogy but it's also expensive. They offer full mtDNA sequencing for the mother side and both STR and SNP testing for the father side. It's all about what you want to spend.For example, you can get your STR or SNP values cheaper at YSEQ but you won't be able to match against the FTDNA database which is useful. FTDNA is the only popular company that offers mtDNA matching.I'm not familiar with the Jewish genealogy site but check to see if they require STR uploads from FTDNA or if they can take YSEQ.