I only believe in the top 10 altcoins - they are more reliable. The rest of the altcoins cause me doubts and I think that in the future they may well disappear, although it is possible that new coins may appear that will replenish the list of top ones.
not all altcoins listed above are good and vice versa, useful altcoins are still being managed by the dev and maybe altcoins listed under the project are more interesting than those in the top 10, and it is interesting to follow for future developments.
Carefully study the white paper before investing, if it helps solve your or problems in the crypto industry as a whole, then it is worthy of attention, it does not matter where it is located.