These two teams do look convincing. But it doesn't rule out the chances that any other club could be a surprise. For almost six-plus years, the Spanish league was ruled by 3 clubs Atletico, Barcelona and Madrid. I think this season they will be the same too. Those three clubs will dominate the league as well for 1st,2nd and 3rd place. But of these three clubs, the most active in the transfer market is Barcelona. I think a lot of people are going to make them strong candidates for the championship this season.
Lot of people undermined Madrid with their squad in CL and LaLiga last season too but they came out as a winner but they showed great spirit and became champions of both. Madrid are strong candidates in my opinion. Barca are also a strong candidates but I have my slight doubts still.
Many people judge from the transfer market that Barcelona do so that is a candidate this season as champions but I also can't predict but it will be a fierce duel this season between Real Madrid with the old squad and Barcelona with the new squad that was brought in.
But that is indeed an example for Real Madrid who were often underestimated last season but were actually champions, but this season there is a possibility as well because they have an old squad but have good skills more than young players.