1, POW or POS?
2, Limited total amount like BTC or unlimited amount like XMR?
3, ASIC-resistant or ASIC-friendly?
4, With ICO or without ICO?
5, With or without pre-mining?
6, Dose development teams rewarded or not?
7, Or do you only care about price and whether it can bring you profit?
I won't necessarily say ideal base on these factors but I think a good alts can be considered to include:-
*Pos
*deflationary more or less
*Without ico but have good partnerships support
*No premine, No Asic mining
*Team reward but lock up
*Price is an important part of investment so yes I do care.