I have owned 5 copies of tec 31 in the last year...I have only ever owned 1 copy of tec 1, but, depends on criteria...if you only want an unrestored tec 31 in mid grade, then it is tougher than a restored tec 1...but, there are far more tec 31 in "all" conditions available , when compared to tec 1, making it, a logical choice...
tough one...there are 5 unrestored tec 1 in the census, and 6 true "restored" copies (2 of them are resubs and the old labels have not been de-censused)...making it about 50/50....there are 20 unrestored tec 31's and 16 restored copies in the census (and I Know of at least 4 other non cgc restored copies, so about 50/50)....but, 4 x the number available...tec 1 is much tougher in any grade, but as 1koko said, is the demand for 31 more than 4x?
rick