the scanlines on big and old sonys are more noticable compared to those on smaller and newer tvs or other brands . if u dont like it u should scout the market for a 25-28 inch philips . i once had a kv29x5d sony , a very nice tv set , but useless for lowres arcade . i dont like 29 inch lowresgaming at all and the sucker weights a ton . so i kept the chassis to repair a broken 25inch sony and trashed the rest.
if it has to be a 29 inch go for a 50-60 hertz tv from the end ninetees with a philips or a toshiba tube , or consider a smaller and newer sony tv like 21x4d , x5d oder 25x5d . so yeah , the thick scanlines are sony specific ( same on the pvm sony broadcasting monitor series ) . some people like it , others dont .
for lowres retrogaming i prefer 20-21 inch monitors / tvs made in the ninetees with philips , toshiba , orion or hitachi tubes . they all have the rough but sharp look u remember from classic arcade machines . newer tvs - tubes ( after year 2000 ) tend to be a little synthetic and superfine without noticable scanlines , which is ok for 640x480 or 800x600 but with 320x240 it sometimes looks very wrong , more like gaming on a lcd screen .
in summery i would say both ur tv sets may be suboptimal for arcade purpose . thomson ( and samsung , tschungwa china etc. ) are mostly lowcost tubes combined with crappy chassis in discounter tvs . there are only a handful worthy for storing , usually the smaller ones < 21 inch . i never encountered a crt of the mentioned manufacturers in 28-29-33 inch of satisfying quality .