This is a very odd question, it is all a matter of personal preference. For most, including myself, Bitcoin is #1 - it is the 'grandfather' per-say of all of these 'newer' aka altcoins. The original is the most logical to choose. Why? There are countless reasons, the most obvious is the market cap vs that of other altcoins, also, the value-$/Btc is at least 30x that of the highest-valued altcoin.